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What are the common factors of 91?

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7 and 13
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What are the common factors of 91 and 156?

The factors of 91 are:   1, 7, 13, 91    The factors of 156 are:   1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156    The common factors are:   1, 13

What are the common factor for 13 91?

The prime factors of 91 are 7 and 13. 13 is a prime number so only has 1 and itself as factors. Therefore the only common factors for 13 and 91 are 1 and 13.