3 x 11 = 33 No exponents are needed.
The prime factorization of 1,080 using exponents is: 23x 33 x 5
27 = 33
21 x 33
33 = 27
The prime factorization of 540 using exponents is: 22 x 33 x 5
33 = 31 x 111
54 = 21 x 33
2 x 33
21 x 33
33 = 27
189 = 33 + 71