231131303320 has 32 divisors (see below), whose sum is σ = 520175383920. Its totient is φ = 92429418880.

The previous prime is 231131303279. The next prime is 231131303339. The reversal of 231131303320 is 23303131132.

It is a junction number, because it is equal to n+sod(n) for n = 231131303291 and 231131303300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559426 + ... + 880465.

Almost surely, 2^231131303320 is an apocalyptic number.

231131303320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231131303320 is an abundant number, since it is smaller than the sum of its proper divisors (289044080600).

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

231131303320 is a wasteful number, since it uses less digits than its factorization.

231131303320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443915 (or 1443911 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 231131303320 its reverse (23303131132), we get a palindrome (254434434452).

The spelling of 231131303320 in words is "two hundred thirty-one billion, one hundred thirty-one million, three hundred three thousand, three hundred twenty".