231513720 has 64 divisors (see below), whose sum is σ = 710709120. Its totient is φ = 60299904.

The previous prime is 231513707. The next prime is 231513721. The reversal of 231513720 is 27315132.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231513721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17274 + ... + 27593.

It is an arithmetic number, because the mean of its divisors is an integer number (11104830).

Almost surely, 2^231513720 is an apocalyptic number.

231513720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231513720 is an abundant number, since it is smaller than the sum of its proper divisors (479195400).

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

231513720 is a wasteful number, since it uses less digits than its factorization.

231513720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44924 (or 44920 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 231513720 is about 15215.5749151979. The cubic root of 231513720 is about 614.0337527025.

Adding to 231513720 its reverse (27315132), we get a palindrome (258828852).

The spelling of 231513720 in words is "two hundred thirty-one million, five hundred thirteen thousand, seven hundred twenty".