128892811 has 2 divisors, whose sum is σ = 128892812. Its totient is φ = 128892810.

The previous prime is 128892787. The next prime is 128892821. The reversal of 128892811 is 118298821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128892811 - 2⁵ = 128892779 is a prime.

It is a super-2 number, since 2×128892811² = 33226713454963442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128892821) 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, 64446405 + 64446406.

It is an arithmetic number, because the mean of its divisors is an integer number (64446406).

Almost surely, 2^128892811 is an apocalyptic number.

128892811 is a deficient number, since it is larger than the sum of its proper divisors (1).

128892811 is an equidigital number, since it uses as much as digits as its factorization.

128892811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 40.

The square root of 128892811 is about 11353.0969783579. The cubic root of 128892811 is about 505.1374471476.

The spelling of 128892811 in words is "one hundred twenty-eight million, eight hundred ninety-two thousand, eight hundred eleven".