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181 is the natural number following 180 and 182.

In mathematics [edit]

• 181 is an odd number
• 181 is a centered number
  • 181 is a centered pentagonal number
  • 181 is a centered 12-gonal number
  • 181 is a centered 18-gonal number
  • 181 is a centered 30-gonal number
  • 181 is a centered square number
  • 181 is a star number that represents a centered hexagram (as in the game of Chinese checkers)
• 181 is a deficient number, as 1 is less than 181
• 181 is an odious number
• 181 is a prime number
  • 181 is a Chen prime
  • 181 is a dihedral prime
  • 181 is a full reptend prime
  • 181 is a palindromic prime
  • 181 is a strobogrammatic prime, the same when viewed upside down
  • 181 is a twin prime with 179
• 181 is a square-free number
• 181 is an undulating number, if written in the ternary, the negaternary, or the nonary numeral systems
• 181 is the difference of 2 square numbers: 91² – 90²
• 181 is the sum of 2 consecutive square numbers: 9² + 10²
• 181 is the sum of 5 consecutive prime numbers: 29 + 31 + 37 + 41 + 43

In geography [edit]

• Langenburg No. 181, Saskatchewan rural municipality in Saskatchewan, Canada
• 181 Fremont Street proposed skyscraper in San Francisco, California
• 181 West Madison Street, Chicago
• Greenbo Lake is a 181-acre (0.73 km²) artificial lake in the Appalachian foothills of Greenup County, Kentucky
• Tolsford Hill is a hill on the North Downs, England with a height of 181 metres
• The Abraham Watson House at 181-183 Sherman Street, Cambridge, Massachusetts
• The Coles Sports and Recreation Center, New York University athletic facility at 181 Mercer Street, New York City
• The General Benjamin Lincoln House National Historic Landmark at 181 North Street, Hingham, Massachusetts
• The Henry Wilson Shoe Shop historic building at 181 West Central Street, Natick, Massachusetts
• The Marianna Historic District historic district, Marianna, Florida contains 181 historic buildings
• The Ritz-Carlton at 181 Wellington Street West, Toronto, Canada
• 181st Street, Manhattan

In the military [edit]

• 181st (Brandon) Battalion, CEF was a unit in the Canadian Expeditionary Force during World War I
• 181st Airlift Squadron is a unit of the Texas Air National Guard
• 181st Infantry Brigade of the United States Army based at Fort McCoy, Wisconsin
• 181st Intelligence Wing is a unit of the United States Air Force located at Hulman Field, Terre Haute, Indiana
• AN/APQ-181 an all-weather, low probability of intercept (LPI) radar system for the U.S. Air Force B-2A Spirit bomber aircraft
• Bücker Bü 181 Bestmann single-engine trainer aircraft during World War II
• USNS Adelphi (T-AG-181) was a ship scheduled to be acquired by the U.S. Navy, however, the program was cancelled
• USNS Fred C. Ainsworth (T-AP-181) was a United States Navy troop transport during World War II
• USNS Potomac (T-AO-181) was a United States Navy Oiler following the Vietnam War
• USS Accokeek (ATA-181) was a United States Navy ATA-174 class auxiliary ocean tugboat during World War II
• USS Flagler (AK-181) was a United States Navy Alamosa-class cargo ship following World War II
• USS Hopewell (DD-181) was a United States Navy Wickes class destroyer following World War I
• USS Pompano (SS-181) was a United States Navy Porpoise-class submarine during World War II
• USS Straub (DE-181) was a United States Navy Cannon-class destroyer escort during World War II

In movies [edit]

• “Dog Daze” is the 181st Our Gang short comedy film, released on July 1, 1939

• ”Rusty Romeos” is the 181st short starring the Three Stooges released October 17, 1957

• “Brannigan” (1975) was the 181st film featuring actor John Wayne

• “181: Fragments of a Journey in Palestine-Israel,” winner of the 2005 Yamagata International Documentary Film Festival

• The war film “The Enemy Below” revolves around the fictitious Buckley-class destroyer escort, the USS Hayes (DE-181) and a German U-boat

In music [edit]

• The song Green Onions (1962) by Booker T. and the MG's ranked #181 on Rolling Stone magazine's list of The 500 Greatest Songs of All Time
• The Rolling Stones, Now! (1965) by The Rolling Stones ranked #181 on Rolling Stone magazine's list of the 500 greatest albums of all time
• Dressed Up as Life (2007) by the Australian alternative rock band Sick Puppies peaked at #181 on the U.S. Billboard 200 albums charts
• The CD The Big Express by XTC reached # 181 on the U.S. Billboard album charts in 1984

In population [edit]

• Hessay, York in North Yorkshire, England has a population of 181
• São Tomé and Príncipe ranks #181 in world population
• U.S. towns with a population of 181 in the 2000 census include:
  • Albert, Kansas
  • Braxton, Mississippi
  • Calumet, Iowa
  • Colburn, Wisconsin
  • Corinth, Kentucky
  • Cottonwood, Texas
  • Goff, Kansas
  • Grandin, North Dakota
  • Hannaford, North Dakota
  • Homestead, Missouri
  • Leona, Texas
  • Meadow Acres, Wyoming
  • Mentor, Kentucky
  • Prairie, Indiana
  • Reeder, North Dakota
  • Spanish Valley, Utah
  • Thornton, Nebraska
  • Yellow Bluff, Alabama

In sports [edit]

• Former Arena Football League quarterback Greg Hopkins had 181 touchdowns in his career from 1996–2003
• 181 is the rider number given to Lance Armstrong in 1999 when he won his first of seven Tour de France consecutive victories. After winning his first, Armstrong returned to each subsequent tour with Number 1 (the number traditionally given to the previous years' defending overall winner)
• Former Thoroughbred horse racing jockey Randy Romero set the Fair Grounds Race Course in New Orleans track record with 181 wins in 1975
• 181 athletes from Belarus competed in 28 events at the 2008 Olympics in Beijing
• 181 competitors (with 48 cyclists finishing the race) competed in The 1994 Amstel Gold Race in Limburg on April 23, 1994
• At the 2004 Daytona 500, Dale Earnhardt, Jr. passed Tony Stewart on Lap 181 and held him off in the remaining laps to win his first Daytona 500 on February 15, 2004
• Retired American Thoroughbred horse racing jockey Randy Romero won a track record 181 races at the Fair Grounds Race Course in New Orleans

In transportation [edit]

• The Volkswagen 181
• The wing area of a Boeing 757 airplane is 181.25 m (1,951 sq ft)
• Lufthansa Flight 181, which was hijacked on October 13, 1977
• TAM Airlines Flight 3054 with 181 passengers aboard crashed upon landing in São Paulo on July 17, 2007
• London Buses route 181
• 181 Union City-New York, a New Jersey Transit bus route from New Jersey to New York
• The Córas Iompair Éireann CIE 181 Class diesel locomotives, and numbered B181 to B192, built by General Motors Electro-Motive Division (EMD) in 1966
• East 181st Avenue, a light rail station on the MAX Blue Line in Gresham, Oregon
• New York City Subway stations in Manhattan:
  • 181st Street (IND Eighth Avenue Line), at Fort Washington Avenue served by the A train
  • 181st Street (IRT Broadway – Seventh Avenue Line), at St. Nicholas Avenue served by the 1 train
• 181st Street (Manhattan)
• Oregon Route 229, also known as the Siletz Highway No. 181
• List of highways numbered 181 include:
  • U.S. Route 181 runs from San Antonio to Corpus Christi, Texas
  • Alabama State Route 181
  • Arizona State Route 181
  • Connecticut Route 181
  • K-181 (Kansas highway)
  • Massachusetts Route 181
  • M-181 (Michigan highway) (former)
  • Missouri Route 181
  • New Jersey Route 181
  • Ohio State Route 181
  • Pennsylvania Route 181
  • Tennessee State Route 181
  • Utah State Route 181
  • Utah State Route 181A (former)
  • Virginia State Route 181
  • Washington State Route 181
  • Wisconsin Highway 181
  • Puerto Rico Highway 181
  • SP-181, São Paulo, Brazil
  • M181 motorway, Scunthorpe, England
  • Route 181 (Japan) connects Tsuyama, Okayama and Yonago, Tottori
  • Pulau Indah Expressway Federal Route 181 in Klang Valley, Selangor, Malaysia

In TV and radio [edit]

• Lisa's Sax, the 181st episode of the Fox animated television series The Simpsons, originally aired on October 19, 1997
• Arlen City Bomber, the 181st episode of the Fox animated television series King of the Hill, originally aired on March 27, 2005
• The Ungroundable, the 181st episode of the Comedy Central animated television series South Park, originally aired on November 19, 2008
• Channel 181 on The Dish Network is the Cartoon Network (West)
• Channel 181 on XM Satellite Radio is MLB Play-by-Play
• 181.fm Internet radio is a group of internet radio stations

In other fields [edit]

181 is also:

• The year AD 181 or 181 BC
• The atomic number of an element temporarily called Unoctunium
• 181 Eucharis is a large K-type Main belt asteroid
• Minuscule 181 (in the Gregory-Aland numbering), α 101 (Soden), is a Greek minuscule manuscript of the New Testament
• Texas has 181 colleges, universities and other higher education institutions
• Mir-181 microRNA precursor is a small non-coding RNA molecule
• The DC Comics war-anthology comic book series Our Fighting Forces ran for 181 issues from 1954–1981
• Revelle College, founded in 1964, had an initial graduating class of 181 undergraduate students

See also [edit]

• List of highways numbered 181
• United Nations Security Council Resolution 181
• United Nations General Assembly Resolution 181 (II) Future Government of Palestine
• United States Supreme Court cases, Volume 181
• Pennsylvania House of Representatives, District 181
• Criminal Code of Belarus, Article 181
• Constitution of Malaysia, Article 181

External links [edit]

Wikimedia Commons has media related to: 181 (number)

• Number Facts and Trivia: 181
• The Number 181
• The Positive Integer 181
• Prime curiosities: 181
• VirtueScience: 181
• Number Gossip: 181
• The Number 181 – I Am with Thee
• 181 FM Internet radio
• International Union of Operating Engineers Local 181, Kentucky
• Motion Picture Projectionists Local 181, Baltimore, MD

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