811320961 has 8 divisors (see below), whose sum is σ = 885412224. Its totient is φ = 737285520.

The previous prime is 811320949. The next prime is 811320989. The reversal of 811320961 is 169023118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 811320961 - 2¹⁷ = 811189889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811320061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20056 + ... + 44998.

It is an arithmetic number, because the mean of its divisors is an integer number (110676528).

Almost surely, 2^811320961 is an apocalyptic number.

It is an amenable number.

811320961 is a deficient number, since it is larger than the sum of its proper divisors (74091263).

811320961 is a wasteful number, since it uses less digits than its factorization.

811320961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27911.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 811320961 is about 28483.6964068921. The cubic root of 811320961 is about 932.6762090370.

The spelling of 811320961 in words is "eight hundred eleven million, three hundred twenty thousand, nine hundred sixty-one".