231512525 has 6 divisors (see below), whose sum is σ = 287075562. Its totient is φ = 185210000.

The previous prime is 231512513. The next prime is 231512573. The reversal of 231512525 is 525215132.

It can be written as a sum of positive squares in 3 ways, for example, as 2111209 + 229401316 = 1453^2 + 15146^2 .

It is not a de Polignac number, because 231512525 - 2⁴ = 231512509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231512494 and 231512503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4630226 + ... + 4630275.

It is an arithmetic number, because the mean of its divisors is an integer number (47845927).

Almost surely, 2^231512525 is an apocalyptic number.

231512525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231512525 is a deficient number, since it is larger than the sum of its proper divisors (55563037).

231512525 is an equidigital number, since it uses as much as digits as its factorization.

231512525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9260511 (or 9260506 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 231512525 is about 15215.5356461743. The cubic root of 231512525 is about 614.0326962185.

Adding to 231512525 its reverse (525215132), we get a palindrome (756727657).

The spelling of 231512525 in words is "two hundred thirty-one million, five hundred twelve thousand, five hundred twenty-five".