231131232320 has 28 divisors (see below), whose sum is σ = 550381247724. Its totient is φ = 92452492800.

The previous prime is 231131232287. The next prime is 231131232359. The reversal of 231131232320 is 23232131132.

It can be written as a sum of positive squares in 2 ways, for example, as 68451303424 + 162679928896 = 261632^2 + 403336^2 .

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, 361142231 + ... + 361142870.

It is an arithmetic number, because the mean of its divisors is an integer number (19656473133).

Almost surely, 2^231131232320 is an apocalyptic number.

231131232320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231131232320 is an abundant number, since it is smaller than the sum of its proper divisors (319250015404).

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

231131232320 is an equidigital number, since it uses as much as digits as its factorization.

231131232320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722285118 (or 722285108 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 231131232320 its reverse (23232131132), we get a palindrome (254363363452).

The spelling of 231131232320 in words is "two hundred thirty-one billion, one hundred thirty-one million, two hundred thirty-two thousand, three hundred twenty".