About the Number 181 (one hundred eighty-one)

This nBAB for the number 181 was created on 2 May 2015 because missing nBABs for the numbers in the [168, 198] sequence were being turned into nBABs. 181 is in the [168, 198] sequence and it didn't have a nBAB.

MathBabbler Number Analyst (MBNA) output:
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181 is a natural, whole, integer
181 is odd
181 proper divisors are: 1,
181 has 1 proper divisors
181 is deficient (sum of divisors is 1; ratio: 0.00552486)
181 is unhappy
181 is a Squarefree Number
181 is prime (not composite)
...Twin prime with 179
...Truman Gerald prime with 211
...Truman Gerald prime with 151
...Pythagorean
...Star
...reversible prime with 181
181 is undulating
181 is centered dodecagonal
181 is palindromic
181 is Arithmetic (A003601)
181 is the sum of 5 consecutive primes
181 = 29 + 31 + 37 + 41 + 43
181 in octal is 0265
181 in hexadecimal is 0xb5
181 in binary is 10110101 (is odious)
181 nearest square numbers: -12...15 (169...196 [14])
sqrt(181) = 13.4536
ln(181) = 5.1985
log(181) = 2.25768
181 reciprocal is .00552486187845303867403314917127
181! is 3.63622e+331
181 is 57.6141 Pi years
181 is 9 score and 1 year
181 written as a Roman numeral is CLXXXI
181 is 91^2 - 90^2 and 91 + 90 = 181
181 is a multiple of 1 & it contains a 1 (A011531)

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 02 May 2015

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This work is licensed under a Creative Commons Attribution 3.0 United States License.