About the Number 641 (six hundred forty-one)

This nBAB for the number 641 was created to test the modified Sexy Primes checking performed by the MBNA.

This nBAB was created along with nBABs for 647, 653, and 659.

MathBabbler Number Analyst (MBNA) output:
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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

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