Common factors of 81
- Common factors of 81 and 27
- Common factors of 81 and 72
- Common factors of 81 and 45
- Common factors of 81 and 54
- Common factors of 81 and 9
- Common factors of 81 and 16
- Common factors of 81 and 64
- Common factors of 81 and 99
- Common factors of 81 and 117
- Common factors of 81 and 108
- Common factors of 81 and 100
- Common factors of 81 and 36
- Common factors of 81 and 48
- Common factors of 81 and 49
- Common factors of 81 and 90