9, 3, 27. that's it.
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The positive integer factors of 81 are:1, 3, 9, 27, 81
81 has these five factors: 1 3 9 27 81.
25/81 is the simplest form: The prime factors of 25 are only 5, and those of 81 are only 3. Therefore, no integer other than 1 can divide both numbers to product an integer result.
The positive integer factors of 1053 are: 1, 3, 9, 13, 27, 39, 81, 117, 351, 1053
All the factors of 81 and 135 are: 1, 3, 9, 27, 45, 81, and 135.