The factors of 1521 are 1, 3, 9, 13, 39, 117, 169, 507, 1521
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factors: 1, 7, 23, 161prime factors: 7, 23
It is a multiple of its factors. These are 1,2,3,5,6,10,15,25,30,50,75 and 150.
1, 3, 9, 13, 39, 117, 169, 507, 1521.
Multiple. Factors go into numbers, numbers go into multiples.
in 1521