161 (number)

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← 160 161 162 →
Cardinalone hundred sixty-one
Ordinal161st
(one hundred sixty-first)
Factorization7 × 23
Divisors1, 7, 23, 161
Greek numeralΡΞΑ´
Roman numeralCLXI
Binary101000012
Ternary122223
Quaternary22014
Quinary11215
Senary4256
Octal2418
Duodecimal11512
HexadecimalA116
Vigesimal8120
Base 364H36

161 (one hundred [and] sixty-one) is the natural number following 160 and preceding 162.

In mathematics[edit]

161 is the sum of five consecutive prime numbers: 23, 29, 31, 37, and 41

161 is a hexagonal pyramidal number.[1]

161 is a semiprime. Since its prime factors 7 and 23 are both Gaussian primes, 161 is a Blum integer.

161 is a palindromic number [2]

In the military[edit]

In music[edit]

In transportation[edit]

In other fields[edit]

161 is also:

See also[edit]

External links[edit]

References[edit]

  1. ^ "Sloane's A002412 : Hexagonal pyramidal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
  2. ^ https://oeis.org/A002113
  3. ^ "161>88" (Documentary). Czech Republic: Antifascist Action. 2012. Retrieved 2 January 2018.