Numbers / 683

The Number 683

683 is prime: only 1 and 683 divide it evenly; the next prime after 683 is 691. 683's proper divisors total just 1, 682 short of 683, the deficient case most of 683's neighbors share too. 683 has a digit sum of 17; for 683, the digital root works out to 8. 683 shares no factor with 2-12; 683's own divisors start beyond that range. 683 is 1010101011 in binary and 2AB in hex; as a Roman numeral it's DCLXXXIII.