231022213 has 4 divisors (see below), whose sum is σ = 232040160. Its totient is φ = 230004268.

The previous prime is 231022201. The next prime is 231022217. The reversal of 231022213 is 312220132.

231022213 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 not a de Polignac number, because 231022213 - 2²¹ = 228925061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231022217) 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, 508633 + ... + 509086.

It is an arithmetic number, because the mean of its divisors is an integer number (58010040).

Almost surely, 2^231022213 is an apocalyptic number.

It is an amenable number.

231022213 is a deficient number, since it is larger than the sum of its proper divisors (1017947).

231022213 is a wasteful number, since it uses less digits than its factorization.

231022213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017946.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231022213 is about 15199.4148900542. The cubic root of 231022213 is about 613.5989106313.

Adding to 231022213 its reverse (312220132), we get a palindrome (543242345).

The spelling of 231022213 in words is "two hundred thirty-one million, twenty-two thousand, two hundred thirteen".