991991

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{991}}^1$

素因数の和:1022

約数の個数: 16

約数和(自身を含む): 1333248

約数和(自身を除く): 341257

約数列:

[1, 7, 11, 13, 77, 91, 143, 991, 1001, 6937, 10901, 12883, 76307, 90181, 141713, 991991]

約数ペア:

[(1, 991991), (7, 141713), (11, 90181), (13, 76307), (77, 12883), (91, 10901), (143, 6937), (991, 1001)]