Factors / Factors of 243

Factors of 243

1, 3, 9, 27, 81, 243

243 breaks into 3 pairs, tested up to √243 ≈ 15.6; each pair multiplies back to 243 exactly. 243's full pair list is (1, 243), (3, 81), (9, 27), for 6 divisors in total. 243's divisors other than 243 itself sum to just 121, 122 below 243: the common deficient case. 243 is odd, digit sum 9 for 243; small divisors of 243 include 3, 9. 243 has 6 divisors; 242 has 6 and 244 has 6, so 242 wins here. 243 divided by its largest divisor, 81, gives 3.