### About the Number 161 (one hundred sixty-one)

This nBAB about the number `161` was BAB# `161` for the fall 2009 semester.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
161 is a natural, whole, integer
161 is odd
161 proper divisors are: 1,7,23,
161 is deficient (sum of divisors is 31)
161 is unhappy
161 is not a Harshad number
161 is not prime
161 has the prime factors: 7*23 (sum=30)
161 is semiprime (biprime or 2-almost prime)
161 sum of prime factors is: 30
161 is undulating
161 is palindromic
161 is the sum of 5 consecutive primes
23 + 29 + 31 + 37 + 41
161 in octal is 0241
161 in hexadecimal is 0xa1
161 in binary is 10100001 (is odious)
161 nearest square numbers: -17...8 (144...169 )
sqrt(161) = 12.6886
ln(161) = 5.0814
log(161) = 2.20683
161 reciprocal is .00621118012422360248447204968944
161! is 7.59071e+286
161 is 51.2479 Pi years
161 is 8 score and 1 year
161 written as a Roman numeral is CLXI
```

`[NumDic.com]` `161` is the difference of two squares (15^2 - 8^2 and 81^2 - 80^2).

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 07 December 2009 