It cannot have a "common" factor as there is nothing for it to be common with...
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The factors are 1, 3, 9, 11, 33, 99, 121, 363, 1089. Pick two.
nine is one number because adding 1+0+8+9=18=1+8=9 which is a quick test method to see if a number is divisible by nine. Then 1089 / 9 = 121 Answer: 9 x 121 = 1089 Then also three would be used so 3 x 363 = 1089 also.
Eight factors.
Anywhere from 1 to an infinite number of factors. 1 has one factor. 9 has three factors. 84 has 12 factors. There is no limit.
Two of them.