231344013 has 4 divisors (see below), whose sum is σ = 308458688. Its totient is φ = 154229340.

The previous prime is 231343997. The next prime is 231344021. The reversal of 231344013 is 310443132.

231344013 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 not a de Polignac number, because 231344013 - 2⁴ = 231343997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231344033) 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, 38557333 + ... + 38557338.

It is an arithmetic number, because the mean of its divisors is an integer number (77114672).

Almost surely, 2^231344013 is an apocalyptic number.

It is an amenable number.

231344013 is a deficient number, since it is larger than the sum of its proper divisors (77114675).

231344013 is an equidigital number, since it uses as much as digits as its factorization.

231344013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77114674.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 231344013 is about 15209.9971400392. The cubic root of 231344013 is about 613.8836805332.

Adding to 231344013 its reverse (310443132), we get a palindrome (541787145).

The spelling of 231344013 in words is "two hundred thirty-one million, three hundred forty-four thousand, thirteen".