231513252 has 24 divisors (see below), whose sum is σ = 568629600. Its totient is φ = 73109376.

The previous prime is 231513221. The next prime is 231513283. The reversal of 231513252 is 252315132.

It is a happy number.

231513252 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231513221) and next prime (231513283).

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, 507477 + ... + 507932.

It is an arithmetic number, because the mean of its divisors is an integer number (23692900).

Almost surely, 2^231513252 is an apocalyptic number.

It is an amenable number.

231513252 is an abundant number, since it is smaller than the sum of its proper divisors (337116348).

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

231513252 is a wasteful number, since it uses less digits than its factorization.

231513252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015435 (or 1015433 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 231513252 is about 15215.5595362116. The cubic root of 231513252 is about 614.0333389502.

Adding to 231513252 its reverse (252315132), we get a palindrome (483828384).

The spelling of 231513252 in words is "two hundred thirty-one million, five hundred thirteen thousand, two hundred fifty-two".