Numbers / 481

The Number 481

481 is composite: factorization 13 × 37. That gives 481 exactly 4 divisors: 1, 13, 37, 481. 481's proper divisors total just 51, 430 short of 481, the deficient case most of 481's neighbors share too. 481 has a digit sum of 13; for 481, the digital root works out to 4. 481 shares no factor with 2-12; 481's own divisors start beyond that range. 481 is 111100001 in binary and 1E1 in hex; as a Roman numeral it's CDLXXXI.