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The given series consists of numbers that can be expressed as powers of 3: (9 = 3^2), (6561 = 3^8), and (43046721 = 3^{16}). The exponents are increasing in a pattern of doubling: (2, 8, 16). Thus, the next exponent should be (32), which means the missing number is (3^{32} = 1853020188851841).
These are squares. 12 = 1 22 = 4 32 = 9 (it is missing 42 = 16) 52 = 25 62 = 36 The next one in the series is probably 72 = 49.
9409
It needs a 3.
It seems to be 16