Numbers / 617

The Number 617

617 is prime: only 1 and 617 divide it evenly; the next prime after 617 is 619. 617's proper divisors total just 1, 616 short of 617, the deficient case most of 617's neighbors share too. 617 has a digit sum of 14; for 617, the digital root works out to 5. 617 shares no factor with 2-12; 617's own divisors start beyond that range. 617 is 1001101001 in binary and 269 in hex; as a Roman numeral it's DCXVII.