7 and/or 13
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91 is the only composite factor of 91. 7 and 13 are prime.
97 is the next prime number after 91.
A person unfamiliar with prime numbers could mistake 51, 91, or any other composite number for a prime number if the person did not factor the number to make sure it had no other factors then 1 and itself.
91 is a multiple of 7. 41 is a prime number.
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.