About the Number 647 (six hundred forty-seven)

This nBAB for the number 647 was created to test the modified Sexy Primes checking performed by the MBNA.

This nBAB was created along with nBABs for 641, 653, and 659.

MathBabbler Number Analyst (MBNA) output:
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647 is a natural, whole, integer
647 is odd
647 proper divisors are: 1,
647 has 1 proper divisors
647 is deficient (sum of divisors is 1; ratio: 0.0015456)
647 is unhappy
647 is a Squarefree Number
647 is prime (not composite)
...Cousin prime with 643
...Sexy prime with 641
...Sexy prime with 653
...Sexy Triplet prime with 641, 653
...Sexy Quadruple prime with 641, 653, 659
...Truman Gerald prime with 677
...Truman Gerald prime with 617
...OEIS:002145 (4n+3; n=161)
...Left-truncatable
...Eisenstein
...prime triplet {641, 643, 647}
647 is Arithmetic (A003601)
647 is the sum of 5 consecutive primes
647 = 113 + 127 + 131 + 137 + 139
647 in octal is 01207
647 in hexadecimal is 0x287
647 in binary is 1010000111 (is odious)
647 nearest square numbers: -22...29 (625...676 [26])
sqrt(647) = 25.4362
ln(647) = 6.47235
log(647) = 2.8109
647 reciprocal is .00154559505409582689335394126738
647 is an apocalyptic power
647! is 2.95895e+1539
647 is 205.946 Pi years
647 is 32 score and 7 years
647 written as a Roman numeral is DCXLVII
647 is 324^2 - 323^2 and 324 + 323 = 647

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 24 September 2015