181 (number)

181 (number)
181 (one hundred [and] eighty-one) is the natural number following 180 and preceding 182.
In mathematics
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
Langenburg No. 181, Saskatchewan rural municipality in Saskatchewan, Canada
181 Fremont Street proposed skyscraper in San Francisco, California
181 West Madison Street, Chicago
In the military
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
was a ship scheduled to be acquired by the United States Navy, however, the program was cancelled
was a United States Navy troop transport during World War II
was a United States Navy oiler following the Vietnam War
was a United States Navy ATA-174-class auxiliary ocean tugboat during World War II
was a United States Navy Alamosa-class cargo ship following World War II
was a United States Navy following World War I
was a United States Navy Porpoise-class submarine during World War II
was a United States Navy during World War II
In movies
“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 , USS Hayes (DE-181) and a German U-boat
In transportation
The Volkswagen 181
Lufthansa Flight 181, which was hijacked on October 13, 1977
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
181st Street (IRT Broadway – Seventh Avenue Line), at St. Nicholas Avenue served by the
181st Street (Manhattan)
Oregon Route 229, also known as the Siletz Highway No. 181
In other fields
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
Mir-181 microRNA precursor is a small non-coding RNA molecule
The number of channels received by a "cable-ready" American television set, with 68 over-the-air television channels (12 VHF channels [2 through 13] and 56 UHF channels [14 through 69]) and 113 cable television channels (channel 1 and channels 14 through 125, excluding VHF channels 2 through 13)
See also
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
References
External links
Number Facts and Trivia: 181
The Number 181
The Positive Integer 181
Prime curiosities: 181
VirtueScience: 181
Number Gossip: 181
181 FM Internet radio
Integers