Numbers / 751

The Number 751

751 is prime: only 1 and 751 divide it evenly; the next prime after 751 is 757. 751's proper divisors total just 1, 750 short of 751, the deficient case most of 751's neighbors share too. 751 has a digit sum of 13; for 751, the digital root works out to 4. 751 shares no factor with 2-12; 751's own divisors start beyond that range. 751 is 1011101111 in binary and 2EF in hex; as a Roman numeral it's DCCLI.