128804891 has 2 divisors, whose sum is σ = 128804892. Its totient is φ = 128804890.

The previous prime is 128804873. The next prime is 128804911. The reversal of 128804891 is 198408821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128804891 - 2¹⁰ = 128803867 is a prime.

It is not a weakly prime, because it can be changed into another prime (128804191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64402445 + 64402446.

It is an arithmetic number, because the mean of its divisors is an integer number (64402446).

Almost surely, 2^128804891 is an apocalyptic number.

128804891 is a deficient number, since it is larger than the sum of its proper divisors (1).

128804891 is an equidigital number, since it uses as much as digits as its factorization.

128804891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 128804891 is about 11349.2242466170. The cubic root of 128804891 is about 505.0225667137.

It can be divided in two parts, 12880 and 4891, that added together give a palindrome (17771).

The spelling of 128804891 in words is "one hundred twenty-eight million, eight hundred four thousand, eight hundred ninety-one".