128266129 has 2 divisors, whose sum is σ = 128266130. Its totient is φ = 128266128.

The previous prime is 128266097. The next prime is 128266157. The reversal of 128266129 is 921662821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125955729 + 2310400 = 11223^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 128266129 - 2⁵ = 128266097 is a prime.

It is not a weakly prime, because it can be changed into another prime (128266199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64133064 + 64133065.

It is an arithmetic number, because the mean of its divisors is an integer number (64133065).

Almost surely, 2^128266129 is an apocalyptic number.

It is an amenable number.

128266129 is a deficient number, since it is larger than the sum of its proper divisors (1).

128266129 is an equidigital number, since it uses as much as digits as its factorization.

128266129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 128266129 is about 11325.4637432646. The cubic root of 128266129 is about 504.3174506020.

The spelling of 128266129 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, one hundred twenty-nine".