Factors / Factors of 171

Factors of 171

1, 3, 9, 19, 57, 171

171 breaks into 3 pairs, tested up to √171 ≈ 13.1; each pair multiplies back to 171 exactly. 171's full pair list is (1, 171), (3, 57), (9, 19), for 6 divisors in total. 171's divisors other than 171 itself sum to just 89, 82 below 171: the common deficient case. 171 is odd, digit sum 9 for 171; small divisors of 171 include 3, 9. 171 has 6 divisors; 170 has 8 and 172 has 6, so 170 wins here. 171 divided by its largest divisor, 57, gives 3.