811309131 has 6 divisors (see below), whose sum is σ = 1171890980. Its totient is φ = 540872748.

The previous prime is 811309129. The next prime is 811309157. The reversal of 811309131 is 131903118.

It is a happy number.

It is not a de Polignac number, because 811309131 - 2¹ = 811309129 is a prime.

It is a super-2 number, since 2×811309131² = 1316445012087950322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 811309095 and 811309104.

It is not an unprimeable number, because it can be changed into a prime (811309171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45072721 + ... + 45072738.

Almost surely, 2^811309131 is an apocalyptic number.

811309131 is a deficient number, since it is larger than the sum of its proper divisors (360581849).

811309131 is a wasteful number, since it uses less digits than its factorization.

811309131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90145465 (or 90145462 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 811309131 is about 28483.4887434808. The cubic root of 811309131 is about 932.6716758482.

The spelling of 811309131 in words is "eight hundred eleven million, three hundred nine thousand, one hundred thirty-one".