Numbers / 361

The Number 361

361 is composite: factorization 19^2. That gives 361 exactly 3 divisors: 1, 19, 361. 361's proper divisors total just 20, 341 short of 361, the deficient case most of 361's neighbors share too. 361 is also a perfect square, since 19² = 361. 361 has a digit sum of 10; for 361, the digital root works out to 1. 361 shares no factor with 2-12; 361's own divisors start beyond that range. 361 is 101101001 in binary and 169 in hex; as a Roman numeral it's CCCLXI.