161 (number)

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← 160 161 162 →
Cardinal one hundred sixty-one
Ordinal 161st
(one hundred and sixty-first)
Factorization 7 × 23
Divisors 1, 7, 23, 161
Roman numeral CLXI
Binary 101000012
Ternary 122223
Quaternary 22014
Quinary 11215
Senary 4256
Octal 2418
Duodecimal 11512
Hexadecimal A116
Vigesimal 8120
Base 36 4H36

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.

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.