231242525 has 6 divisors (see below), whose sum is σ = 286740762. Its totient is φ = 184994000.

The previous prime is 231242513. The next prime is 231242537. The reversal of 231242525 is 525242132.

It is an interprime number because it is at equal distance from previous prime (231242513) and next prime (231242537).

It can be written as a sum of positive squares in 3 ways, for example, as 61748164 + 169494361 = 7858^2 + 13019^2 .

It is not a de Polignac number, because 231242525 - 2⁴ = 231242509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231242494 and 231242503.

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, 4624826 + ... + 4624875.

It is an arithmetic number, because the mean of its divisors is an integer number (47790127).

Almost surely, 2^231242525 is an apocalyptic number.

231242525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231242525 is a deficient number, since it is larger than the sum of its proper divisors (55498237).

231242525 is an equidigital number, since it uses as much as digits as its factorization.

231242525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9249711 (or 9249706 counting only the distinct ones).

The product of its digits is 4800, while the sum is 26.

The square root of 231242525 is about 15206.6605472734. The cubic root of 231242525 is about 613.7938994625.

Adding to 231242525 its reverse (525242132), we get a palindrome (756484657).

The spelling of 231242525 in words is "two hundred thirty-one million, two hundred forty-two thousand, five hundred twenty-five".