Factors / Factors of 331

Factors of 331

1, 331

331 is prime: only factor pair is (1, 331), confirmed by trial division up to √331 ≈ 18.2 turning up nothing else. 331's full pair list is (1, 331), for 2 divisors in total. 331's divisors other than 331 itself sum to just 1, 330 below 331: the common deficient case. 331 is odd, digit sum 7 for 331; none of 2-12 divide 331 evenly. 331 has 2 divisors; 330 has 16 and 332 has 6, so 330 wins here. 331 divided by its largest divisor, 1, gives 331.