The given series is 9 81 ? 6561 59049
It follows a pattern that
9
81 = 9 x 9
729 = 9 x 9 x 9
6561 = 9 x 9 x 9 x 9
59049 = 9 x 9 x 9 x 9 x 9
Hence, the missing number in the series is 729.
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