Numbers / 109

The Number 109

109 is prime: only 1 and 109 divide it evenly; the next prime after 109 is 113. 109's proper divisors total just 1, 108 short of 109, the deficient case most of 109's neighbors share too. 109 has a digit sum of 10; for 109, the digital root works out to 1. 109 shares no factor with 2-12; 109's own divisors start beyond that range. 109 is 1101101 in binary and 6D in hex; as a Roman numeral it's CIX.