128256967 has 2 divisors, whose sum is σ = 128256968. Its totient is φ = 128256966.

The previous prime is 128256929. The next prime is 128257001. The reversal of 128256967 is 769652821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128256967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128256907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64128483 + 64128484.

It is an arithmetic number, because the mean of its divisors is an integer number (64128484).

Almost surely, 2^128256967 is an apocalyptic number.

128256967 is a deficient number, since it is larger than the sum of its proper divisors (1).

128256967 is an equidigital number, since it uses as much as digits as its factorization.

128256967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 128256967 is about 11325.0592492931. The cubic root of 128256967 is about 504.3054425826.

The spelling of 128256967 in words is "one hundred twenty-eight million, two hundred fifty-six thousand, nine hundred sixty-seven".