231331404 has 24 divisors (see below), whose sum is σ = 540691200. Its totient is φ = 76979344.

The previous prime is 231331391. The next prime is 231331409. The reversal of 231331404 is 404133132.

It is a super-2 number, since 2×231331404² = 107028436953222432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231331409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8904 + ... + 23279.

It is an arithmetic number, because the mean of its divisors is an integer number (22528800).

Almost surely, 2^231331404 is an apocalyptic number.

It is an amenable number.

231331404 is an abundant number, since it is smaller than the sum of its proper divisors (309359796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231331404 is a wasteful number, since it uses less digits than its factorization.

231331404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32789 (or 32787 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 231331404 is about 15209.5826372718. The cubic root of 231331404 is about 613.8725274459.

Adding to 231331404 its reverse (404133132), we get a palindrome (635464536).

The spelling of 231331404 in words is "two hundred thirty-one million, three hundred thirty-one thousand, four hundred four".