For 13: 13
For 81: 3
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The Prime Factor of 81 is 3The Prime Factors of 28 are 2, 7
1, 3, 9, 27, 81 81 27,3 9,3,3 3,3,3,3
13 is a prime factor of itself Prime factors of 30 are: 2, 3 and 5
As a product of its prime factors: 2*5*5*13 = 650
13 is a prime number so the only factors are 1 and itself.