181 (number)

181 (one hundred [and] eighty-one) is the natural number following 180 and preceding 182.

← 180 181 182 →
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Cardinalone hundred eighty-one
Ordinal181st
(one hundred eighty-first)
Factorizationprime
Prime42nd
Divisors1, 181
Greek numeralΡΠΑ´
Roman numeralCLXXXI
Binary101101012
Ternary202013
Quaternary23114
Quinary12115
Senary5016
Octal2658
Duodecimal13112
HexadecimalB516
Vigesimal9120
Base 365136

In mathematics

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

In movies

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 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

In other fields

181 is also:

See also

References
  1. "Sloane's A005891 : Centered pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
  2. "Sloane's A003154 : Centered 12-gonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
  3. "Sloane's A069131 : Centered 18-gonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
  4. "Sloane's A001844 : Centered square numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
  5. "Sloane's A109611 : Chen primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
  6. "Sloane's A001913 : Full reptend primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
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