813894831 has 32 divisors (see below), whose sum is σ = 1249920000. Its totient is φ = 522807264.

The previous prime is 813894821. The next prime is 813894847. The reversal of 813894831 is 138498318.

It is not a de Polignac number, because 813894831 - 2¹⁰ = 813893807 is a prime.

It is a super-2 number, since 2×813894831² = 1324849591857037122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813894821) 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 31 ways as a sum of consecutive naturals, for example, 581070 + ... + 582468.

It is an arithmetic number, because the mean of its divisors is an integer number (39060000).

Almost surely, 2^813894831 is an apocalyptic number.

813894831 is a deficient number, since it is larger than the sum of its proper divisors (436025169).

813894831 is a wasteful number, since it uses less digits than its factorization.

813894831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180 (or 2174 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 813894831 is about 28528.8420900674. The cubic root of 813894831 is about 933.6614554512.

The spelling of 813894831 in words is "eight hundred thirteen million, eight hundred ninety-four thousand, eight hundred thirty-one".