Each of these factor pairs (multiply the numbers in parentheses) equals 441:
(1, 441)
(3, 147)
(7, 63)
(9, 49)
(21, 21)
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The factors of 441 are: 1 3 7 9 21 49 63 147 441 The prime factors are: 3, 7
The prime factorization of 441 is 3 x 3 x 7 x 7
The GCF is 63.
3 x 3 x 7 x 7 = 441
Greatest common factor of 135 and 441 is 9.