231538560 has 256 divisors, whose sum is σ = 848966400. Its totient is φ = 53084160.

The previous prime is 231538547. The next prime is 231538583. The reversal of 231538560 is 65835132.

It is a super-2 number, since 2×231538560² = 107220209533747200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 400992 + ... + 401568.

It is an arithmetic number, because the mean of its divisors is an integer number (3316275).

Almost surely, 2^231538560 is an apocalyptic number.

231538560 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 231538560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (424483200).

231538560 is an abundant number, since it is smaller than the sum of its proper divisors (617427840).

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

231538560 is a wasteful number, since it uses less digits than its factorization.

231538560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 231538560 is about 15216.3911621646. The cubic root of 231538560 is about 614.0557126004.

It can be divided in two parts, 23153 and 8560, that added together give a palindrome (31713).

The spelling of 231538560 in words is "two hundred thirty-one million, five hundred thirty-eight thousand, five hundred sixty".