3 x 3 x 3 x 3
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625 and 81 are relatively prime because they have common prime factors.
The prime factorization of 81 is 3x3x3x3 or 34 in exponential form.
The only prime numbers between 81 and 90 is... 83
They are: 79+2 = 81
It is a composite number, you can get 81 by mulitpling 1*81, 3*27, and 9*9.compositeNo the number 81 is not prime it can be divided by nine.composite