81 = 1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1.
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The only prime numbers between 81 and 90 is... 83
They are: 79+2 = 81
If you mean: 53 81 41 47 and 31 then 81 is a composite number while all the rest are prime numbers
39,39,1,1 (: If you mean multiplication, 1, 3, 9, 27, 81 are all factors of 81.
There is no such fraction.