The prime factorization of 441 is 3 x 3 x 7 x 7
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Each of these factor pairs (multiply the numbers in parentheses) equals 441: (1, 441) (3, 147) (7, 63) (9, 49) (21, 21)
The factor pairs of 51 are: 1 x 51 3 x 17
2 is a factor.
Greatest common factor of 135 and 441 is 9.
The greatest common factor of 147 and 196 is 49.