About the Number 509 (five hundred nine)

It took @mathbabbler 509 days to tweet one kilotweet.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   509 is a natural, whole, integer
   509 is odd
   509 proper divisors are: 1,
   509 is deficient (sum of divisors is 1)
   509 is unhappy
   509 is not a Harshad number
   509 is prime
   ...Sexy prime with 503
   ...Sophie Germain prime with 1019
   ...Truman Gerald prime with 479
   ...Pythagorean
   ...Super
   ...Eisenstein
   509 in octal is 0775
   509 in hexadecimal is 0x1fd
   509 in binary is 111111101 (is evil)
   509 nearest square numbers: -25...20 (484...529 [23])
   sqrt(509) = 22.561
   ln(509) = 6.23245
   log(509) = 2.70672
   509 reciprocal is .00196463654223968565815324165029
   509! is 2.60603e+1158
   509 is 162.02 Pi years
   509 is 25 score and 9 years
   509 written as a Roman numeral is DIX
   509 = 255^2 - 254^2 and 255 + 254 = 509

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 30 October 2010