128065121 has 2 divisors, whose sum is σ = 128065122. Its totient is φ = 128065120.

The previous prime is 128065033. The next prime is 128065159. The reversal of 128065121 is 121560821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70896400 + 57168721 = 8420^2 + 7561^2 .

It is a cyclic number.

It is not a de Polignac number, because 128065121 - 2¹⁴ = 128048737 is a prime.

It is not a weakly prime, because it can be changed into another prime (128065321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64032560 + 64032561.

It is an arithmetic number, because the mean of its divisors is an integer number (64032561).

Almost surely, 2^128065121 is an apocalyptic number.

It is an amenable number.

128065121 is a deficient number, since it is larger than the sum of its proper divisors (1).

128065121 is an equidigital number, since it uses as much as digits as its factorization.

128065121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 128065121 is about 11316.5861018242. The cubic root of 128065121 is about 504.0538714252.

The spelling of 128065121 in words is "one hundred twenty-eight million, sixty-five thousand, one hundred twenty-one".