### About the Number 317 (three hundred seventeen)

The 3rd Friday the 13th for 2015 was on day number 317 of the year.

MathBabbler Number Analyst (MBNA) output:
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317 is a natural, whole, integer
317 is odd
317 proper divisors are: 1,
317 has 1 proper divisors
317 is deficient (sum of divisors is 1; ratio: 0.00315457)
317 is unhappy
317 is a Squarefree Number
317 is prime (not composite)
...Cousin prime with 313
...Sexy prime with 311
...Truman Gerald prime with 347
...Pythagorean
...Left-truncatable
...Right-truncatable
...Eisenstein
...prime triplet {311, 313, 317}
317 is Arithmetic (A003601)
317 in octal is 0475
317 in binary is 100111101 (is evil)
317 nearest square numbers: -28...7 (289...324 [18])
sqrt(317) = 17.8045
ln(317) = 5.7589
log(317) = 2.50106
317 reciprocal is .00315457413249211356466876971608
317! is 6.51882e+656
317 is 100.904 Pi years
317 is 15 score and 17 years
317 written as a Roman numeral is CCCXVII
317 is 159^2 - 158^2 and 159 + 158 = 317
317 is a multiple of 1 & it contains a 1 (A011531)

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 13 November 2015