161 (one hundred [and] sixty-one) is the natural number following 160 and preceding 162.
In mathematics 161 is the sum of five consecutive prime numbers: 23, 29, 31, 37, and 41. 161 is a hexagonal pyramidal number. 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. is a commonly used rational approximation of the square root of 5 and is the closest fraction with denominator <300 to that number.
In other fields 161 as a code for Anti-Fascist Action (A=1, F=6, by order of the alphabet), sometimes used in 161>88 (88 being code for Heil Hitler among neo-nazis, as H=8)
External links
Number Facts and Trivia: 161 The Number 161 VirtueScience: 161
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