Numbers / 263

The Number 263

263 is prime: only 1 and 263 divide it evenly; the next prime after 263 is 269. 263's proper divisors total just 1, 262 short of 263, the deficient case most of 263's neighbors share too. 263 has a digit sum of 11; for 263, the digital root works out to 2. 263 shares no factor with 2-12; 263's own divisors start beyond that range. 263 is 100000111 in binary and 107 in hex; as a Roman numeral it's CCLXIII.