1, 3, 9, 27, 81, -1, -3, -9, -27, -81
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If that's 81 - 16k2, it factors neatly as the difference of squares into (9 - 4k)(9 + 4k)If that's 81 + 16k2, it factors to (4k -9i)(4k + 9i) where i is the square root of negative one.
81 has 5 factors: 1, 3, 9, 27, and 81.
Factors of 81 are 1, 3, 9, 27, and 81 Factors of 99 are 1, 3, 9, 11, 33, and 99 The GCF of 81 and 99 is 9
The common factors of 18 and 81 are; 1, 3, and 9. The factors of 18 are; 1, 2, 3, 6, 9, and 18. The factors of 81 are 1, 3, 9, 27, and 81.
The common factors of 72 and 81 are: 1, 3, and 9