231975213 has 4 divisors (see below), whose sum is σ = 309300288. Its totient is φ = 154650140.

The previous prime is 231975179. The next prime is 231975241. The reversal of 231975213 is 312579132.

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 a de Polignac number, because none of the positive numbers 2^k-231975213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231975283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38662533 + ... + 38662538.

It is an arithmetic number, because the mean of its divisors is an integer number (77325072).

Almost surely, 2^231975213 is an apocalyptic number.

It is an amenable number.

231975213 is a deficient number, since it is larger than the sum of its proper divisors (77325075).

231975213 is an equidigital number, since it uses as much as digits as its factorization.

231975213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77325074.

The product of its digits is 11340, while the sum is 33.

The square root of 231975213 is about 15230.7325168555. The cubic root of 231975213 is about 614.4414811632.

The spelling of 231975213 in words is "two hundred thirty-one million, nine hundred seventy-five thousand, two hundred thirteen".