231444213 has 64 divisors (see below), whose sum is σ = 425736192. Its totient is φ = 107930880.

The previous prime is 231444211. The next prime is 231444217. The reversal of 231444213 is 312444132.

It is not a de Polignac number, because 231444213 - 2¹ = 231444211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231444211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 110070 + ... + 112152.

It is an arithmetic number, because the mean of its divisors is an integer number (6652128).

Almost surely, 2^231444213 is an apocalyptic number.

It is an amenable number.

231444213 is a deficient number, since it is larger than the sum of its proper divisors (194291979).

231444213 is a wasteful number, since it uses less digits than its factorization.

231444213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154.

The product of its digits is 2304, while the sum is 24.

The square root of 231444213 is about 15213.2906696743. The cubic root of 231444213 is about 613.9722964225.

Adding to 231444213 its reverse (312444132), we get a palindrome (543888345).

It can be divided in two parts, 231 and 444213, that added together give a palindrome (444444).

The spelling of 231444213 in words is "two hundred thirty-one million, four hundred forty-four thousand, two hundred thirteen".