231130213 has 4 divisors (see below), whose sum is σ = 231231040. Its totient is φ = 231029388.

The previous prime is 231130177. The next prime is 231130217. The reversal of 231130213 is 312031132.

231130213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-231130213 is a prime.

It is a super-2 number, since 2×231130213² = 106842350722850738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231130217) 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, 46893 + ... + 51586.

It is an arithmetic number, because the mean of its divisors is an integer number (57807760).

Almost surely, 2^231130213 is an apocalyptic number.

It is an amenable number.

231130213 is a deficient number, since it is larger than the sum of its proper divisors (100827).

231130213 is an equidigital number, since it uses as much as digits as its factorization.

231130213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100826.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 231130213 is about 15202.9672432720. The cubic root of 231130213 is about 613.6945123450.

Adding to 231130213 its reverse (312031132), we get a palindrome (543161345).

The spelling of 231130213 in words is "two hundred thirty-one million, one hundred thirty thousand, two hundred thirteen".