Factors / Factors of 311

Factors of 311

1, 311

311 is prime: only factor pair is (1, 311), confirmed by trial division up to √311 ≈ 17.6 turning up nothing else. 311's full pair list is (1, 311), for 2 divisors in total. 311's divisors other than 311 itself sum to just 1, 310 below 311: the common deficient case. 311 is odd, digit sum 5 for 311; none of 2-12 divide 311 evenly. 311 has 2 divisors; 310 has 8 and 312 has 16, so 312 wins here. 311 divided by its largest divisor, 1, gives 311.