This nBAB for the number

641was created to test the modifiedSexy Primeschecking performed by the MBNA.This nBAB was created along with nBABs for 647, 653, and 659.

MathBabbler Number Analyst (MBNA) output: ========================================= 641 is a natural, whole, integer 641 is odd 641 proper divisors are: 1, 641 has 1 proper divisors 641 is deficient (sum of divisors is 1; ratio: 0.00156006) 641 is unhappy 641 is a Squarefree Number 641 is prime (not composite) ...Sexy prime with 647 ...Sexy Quadruple prime with 647, 653, 659 ...Sophie Germain prime with 1283 ...Twin prime with 643 ...Pythagorean ...Left-truncatable ...Eisenstein 641 is Arithmetic (A003601) 641 in octal is 01201 641 in hexadecimal is 0x281 641 in binary is 1010000001 (is odious) 641 nearest square numbers: -16...35 (625...676 [26]) sqrt(641) = 25.318 ln(641) = 6.46303 log(641) = 2.80686 641 reciprocal is .00156006240249609984399375975039 641! is 4.12866e+1522 641 is 204.037 Pi years 641 is 32 score and 1 year 641 written as a Roman numeral is DCXLI 641 is 321^2 - 320^2 and 321 + 320 = 641 641 is a multiple of 1 & it contains a 1 (A011531)

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 24 September 2015

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