813231772 has 12 divisors (see below), whose sum is σ = 1423443616. Its totient is φ = 406533600.

The previous prime is 813231721. The next prime is 813231817. The reversal of 813231772 is 277132318.

It is a happy number.

It is a super-2 number, since 2×813231772² = 1322691829980519968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5272 + ... + 40672.

Almost surely, 2^813231772 is an apocalyptic number.

It is an amenable number.

813231772 is a deficient number, since it is larger than the sum of its proper divisors (610211844).

813231772 is a wasteful number, since it uses less digits than its factorization.

813231772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41148 (or 41146 counting only the distinct ones).

The product of its digits is 14112, while the sum is 34.

The square root of 813231772 is about 28517.2188686064. The cubic root of 813231772 is about 933.4078433146.

The spelling of 813231772 in words is "eight hundred thirteen million, two hundred thirty-one thousand, seven hundred seventy-two".