Factors / Factors of 231

Factors of 231

1, 3, 7, 11, 21, 33, 77, 231

231 breaks into 4 pairs, tested up to √231 ≈ 15.2; each pair multiplies back to 231 exactly. 231's full pair list is (1, 231), (3, 77), (7, 33), (11, 21), for 8 divisors in total. 231's divisors other than 231 itself sum to just 153, 78 below 231: the common deficient case. 231 is odd, digit sum 6 for 231; small divisors of 231 include 3, 7, 11. 231 has 8 divisors; 230 has 8 and 232 has 8, so 230 wins here. 231 divided by its largest divisor, 77, gives 3.