231031520 has 48 divisors (see below), whose sum is σ = 548302608. Its totient is φ = 91991040.

The previous prime is 231031453. The next prime is 231031531. The reversal of 231031520 is 25130132.

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, 33140 + ... + 39500.

It is an arithmetic number, because the mean of its divisors is an integer number (11422971).

Almost surely, 2^231031520 is an apocalyptic number.

231031520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231031520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274151304).

231031520 is an abundant number, since it is smaller than the sum of its proper divisors (317271088).

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

231031520 is a wasteful number, since it uses less digits than its factorization.

231031520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6603 (or 6595 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 231031520 is about 15199.7210500719. The cubic root of 231031520 is about 613.6071503705.

Adding to 231031520 its reverse (25130132), we get a palindrome (256161652).

The spelling of 231031520 in words is "two hundred thirty-one million, thirty-one thousand, five hundred twenty".