811320959 has 4 divisors (see below), whose sum is σ = 811380816. Its totient is φ = 811261104.

The previous prime is 811320949. The next prime is 811320989. The reversal of 811320959 is 959023118.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 811320959 - 2⁸ = 811320703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811320949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187 + ... + 40299.

It is an arithmetic number, because the mean of its divisors is an integer number (202845204).

Almost surely, 2^811320959 is an apocalyptic number.

811320959 is a deficient number, since it is larger than the sum of its proper divisors (59857).

811320959 is a wasteful number, since it uses less digits than its factorization.

811320959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59856.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 811320959 is about 28483.6963717843. The cubic root of 811320959 is about 932.6762082706.

The spelling of 811320959 in words is "eight hundred eleven million, three hundred twenty thousand, nine hundred fifty-nine".