231531501242225 has 12 divisors (see below), whose sum is σ = 287099603489520. Its totient is φ = 185224851349200.

The previous prime is 231531501242203. The next prime is 231531501242233. The reversal of 231531501242225 is 522242105135132.

It is not a de Polignac number, because 231531501242225 - 2¹² = 231531501238129 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5203790 + ... + 22139160.

It is an arithmetic number, because the mean of its divisors is an integer number (23924966957460).

Almost surely, 2^{231531501242225} is an apocalyptic number.

231531501242225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231531501242225 is a deficient number, since it is larger than the sum of its proper divisors (55568102247295).

231531501242225 is a wasteful number, since it uses less digits than its factorization.

231531501242225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17482240 (or 17482235 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 231531501242225 its reverse (522242105135132), we get a palindrome (753773606377357).

The spelling of 231531501242225 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, five hundred one million, two hundred forty-two thousand, two hundred twenty-five".