128576891 has 2 divisors, whose sum is σ = 128576892. Its totient is φ = 128576890.

The previous prime is 128576881. The next prime is 128576909. The reversal of 128576891 is 198675821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128576891 - 2⁶ = 128576827 is a prime.

It is not a weakly prime, because it can be changed into another prime (128576801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64288445 + 64288446.

It is an arithmetic number, because the mean of its divisors is an integer number (64288446).

Almost surely, 2^128576891 is an apocalyptic number.

128576891 is a deficient number, since it is larger than the sum of its proper divisors (1).

128576891 is an equidigital number, since it uses as much as digits as its factorization.

128576891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 47.

The square root of 128576891 is about 11339.1750581777. The cubic root of 128576891 is about 504.7244073518.

The spelling of 128576891 in words is "one hundred twenty-eight million, five hundred seventy-six thousand, eight hundred ninety-one".