The only prime factor of 2809 is 53.
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For 86, 2 and 43. For 112, 2 and 7.
35 can be a factor, but it is not prime.
There is no factorization. 37 is a prime number.37 is already prime. Its only prime factor is itself.
81 is not prime. Its prime factorization is 3x3x3x3.
No, 51 isn't prime. 17 is the largest prime factor of 306.