About the Number 503 (five hundred three)

It took @mathbabbler 509 days to tweet one kilotweet. While in the process of creating a nBAB for 509, MathBabbler learned that 509 was a sexy prime with 503.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   503 is a natural, whole, integer
   503 is odd
   503 proper divisors are: 1,
   503 is deficient (sum of divisors is 1)
   503 is unhappy
   503 is not a Harshad number
   503 is prime
   ...Cousin prime with 499
   ...Safe prime with 251
   ...Sexy prime with 509
   ...OEIS:002145 (4n+3; n=125)
   ...Left-truncatable
   ...Eisenstein
   503 is the sum of 3 consecutive primes
   503 = 163 + 167 + 173
   503 in octal is 0767
   503 in hexadecimal is 0x1f7
   503 in binary is 111110111 (is evil)
   503 nearest square numbers: -19...26 (484...529 [23])
   sqrt(503) = 22.4277
   ln(503) = 6.22059
   log(503) = 2.70157
   503 reciprocal is .00198807157057654075546719681908
   503! is 1.54354e+1142
   503 is 160.11 Pi years
   503 is 25 score and 3 years
   503 written as a Roman numeral is DIII
   503 = 252^2 - 251^2 and 252 + 251 = 503

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 31 October 2010