231525213 has 4 divisors (see below), whose sum is σ = 308700288. Its totient is φ = 154350140.

The previous prime is 231525197. The next prime is 231525251. The reversal of 231525213 is 312525132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231525213 - 2⁴ = 231525197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231525113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38587533 + ... + 38587538.

It is an arithmetic number, because the mean of its divisors is an integer number (77175072).

Almost surely, 2^231525213 is an apocalyptic number.

It is an amenable number.

231525213 is a deficient number, since it is larger than the sum of its proper divisors (77175075).

231525213 is an equidigital number, since it uses as much as digits as its factorization.

231525213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77175074.

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

The square root of 231525213 is about 15215.9525827337. The cubic root of 231525213 is about 614.0439133287.

The spelling of 231525213 in words is "two hundred thirty-one million, five hundred twenty-five thousand, two hundred thirteen".