No - the positive integer factors of 81 are:
1, 3, 9, 27, 81
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Since 81 is not divisible by 7 therefore, 7 is not a factor of 81.
Nine is the highest common factor of 81 and 9
No, 18 is not a factor of 81.
For 13: 13 For 81: 3
The GCF of 53 and 81 is 1.