Numbers / 277
The Number 277
277 is prime: only 1 and 277 divide it evenly; the next prime after 277 is 281. 277's proper divisors total just 1, 276 short of 277, the deficient case most of 277's neighbors share too. 277 has a digit sum of 16; for 277, the digital root works out to 7. 277 shares no factor with 2-12; 277's own divisors start beyond that range. 277 is 100010101 in binary and 115 in hex; as a Roman numeral it's CCLXXVII.