Factors / Factors of 531

Factors of 531

1, 3, 9, 59, 177, 531

531 breaks into 3 pairs, tested up to √531 ≈ 23.0; each pair multiplies back to 531 exactly. 531's full pair list is (1, 531), (3, 177), (9, 59), for 6 divisors in total. 531's divisors other than 531 itself sum to just 249, 282 below 531: the common deficient case. 531 is odd, digit sum 9 for 531; small divisors of 531 include 3, 9. 531 has 6 divisors; 530 has 8 and 532 has 12, so 532 wins here. 531 divided by its largest divisor, 177, gives 3.