507 is composite. It is divisible by 3, 13, 39, and 169, as well as by 1 and itself.
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The prime factorization of 507 is 3 x 13 x 13
1521 is a composite number. Its positive integer factors are: 1, 3, 9, 13, 39, 117, 169, 507, 1521
4, composite. 67, prime.
Prime
1 is special 2 prime 3 prime 4 composite 5 prime 6 composite 7 prime 8 composite 9 composite 10 composite 11 prime 12 composite ext.