Numbers / 919

The Number 919

919 is prime: only 1 and 919 divide it evenly; the next prime after 919 is 929. 919's proper divisors total just 1, 918 short of 919, the deficient case most of 919's neighbors share too. 919 is also a palindrome, since 919 reads identically forwards and backwards. 919 has a digit sum of 19; for 919, the digital root works out to 1. 919 shares no factor with 2-12; 919's own divisors start beyond that range. 919 is 1110010111 in binary and 397 in hex; as a Roman numeral it's CMXIX.