Factors / Factors of 31

Factors of 31

1, 31

31 is prime: only factor pair is (1, 31), confirmed by trial division up to √31 ≈ 5.6 turning up nothing else. 31's full pair list is (1, 31), for 2 divisors in total. 31's divisors other than 31 itself sum to just 1, 30 below 31: the common deficient case. 31 is odd, digit sum 4 for 31; none of 2-12 divide 31 evenly. 31 has 2 divisors; 30 has 8 and 32 has 6, so 30 wins here. 31 divided by its largest divisor, 1, gives 31.