Numbers / 503

The Number 503

503 is prime: only 1 and 503 divide it evenly; the next prime after 503 is 509. 503's proper divisors total just 1, 502 short of 503, the deficient case most of 503's neighbors share too. 503 has a digit sum of 8; for 503, the digital root works out to 8. 503 shares no factor with 2-12; 503's own divisors start beyond that range. 503 is 111110111 in binary and 1F7 in hex; as a Roman numeral it's DIII.