231311320 has 32 divisors (see below), whose sum is σ = 547844400. Its totient is φ = 87654528.

The previous prime is 231311287. The next prime is 231311357. The reversal of 231311320 is 23113132.

It is a junction number, because it is equal to n+sod(n) for n = 231311294 and 231311303.

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, 151419 + ... + 152938.

Almost surely, 2^231311320 is an apocalyptic number.

231311320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231311320 is an abundant number, since it is smaller than the sum of its proper divisors (316533080).

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

231311320 is a wasteful number, since it uses less digits than its factorization.

231311320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304387 (or 304383 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 231311320 is about 15208.9223812866. The cubic root of 231311320 is about 613.8547616310.

Adding to 231311320 its reverse (23113132), we get a palindrome (254424452).

The spelling of 231311320 in words is "two hundred thirty-one million, three hundred eleven thousand, three hundred twenty".