It is: 3+17 = 20
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51 = 3*17, which is the prime factorization. Thus, the prime factors of 51 are 3 and 17. Prime factors are factors that are prime. (They don't have any factors themselves except for 1 and themselves.)3 x 17
The prime factors of 28 are 2 and 7. Their sum is 9.
No, 51 is not a prime number. A prime number is a number that has only itself and 1 as a factor. 51's factors are 1,3,17, and 51.
The factors of 91 are: 1 7 13 91.The prime factors are: 7 x 13The sum of the prime factors = 7 + 13 = 20
ANSWER: 61 is a prime number but 51 is a composite number.61 is a prime number because the factors of 61 are 1 and itself (61).51 is a composite number because the factors of 51 other 1 and itself (51) are 3 and 17.