Numbers / 223

The Number 223

223 is prime: only 1 and 223 divide it evenly; the next prime after 223 is 227. 223's proper divisors total just 1, 222 short of 223, the deficient case most of 223's neighbors share too. 223 has a digit sum of 7; for 223, the digital root works out to 7. 223 shares no factor with 2-12; 223's own divisors start beyond that range. 223 is 11011111 in binary and DF in hex; as a Roman numeral it's CCXXIII.