1, 3, and 9 are.
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The factors of 36 are:1, 2, 3, 4, 6, 9, 12, 18, 36.The factors of 81 are:1, 3, 9, 27, 81.The common factors are:1, 3, 9.
The common factors of 27 and 81 are: 1, 3, 9, and 27
The common factors of 81 and 135 are: 1, 3, 9, and 27
The factors of 81 are 1, 3, 9, 27, 81. For them to be common, they need to be compared to another set of factors.
The GCF of 81 135 is 27