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The factors of 81 are 1, 3, 9, 27, and 81 .
The factors of 81 are 1, 3, 9, 27, and 81
The positive integer factors of 81 are:1, 3, 9, 27, 81
81 has these five factors: 1 3 9 27 81.
Because it has more than two factors and it is also a square number in which 9 times 9 = 81