813900959 has 4 divisors (see below), whose sum is σ = 861777504. Its totient is φ = 766024416.

The previous prime is 813900937. The next prime is 813900961. The reversal of 813900959 is 959009318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813900959 is a prime.

It is a super-2 number, since 2×813900959² = 1324869542122239362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813900859) 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 3 ways as a sum of consecutive naturals, for example, 23938247 + ... + 23938280.

It is an arithmetic number, because the mean of its divisors is an integer number (215444376).

Almost surely, 2^813900959 is an apocalyptic number.

813900959 is a deficient number, since it is larger than the sum of its proper divisors (47876545).

813900959 is a wasteful number, since it uses less digits than its factorization.

813900959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47876544.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 813900959 is about 28528.9494899479. The cubic root of 813900959 is about 933.6637986954.

The spelling of 813900959 in words is "eight hundred thirteen million, nine hundred thousand, nine hundred fifty-nine".