231240331213 has 4 divisors (see below), whose sum is σ = 238699696768. Its totient is φ = 223780965660.

The previous prime is 231240331199. The next prime is 231240331229. The reversal of 231240331213 is 312133042132.

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 231240331213 - 2⁵ = 231240331181 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 (231240331243) 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, 3729682731 + ... + 3729682792.

It is an arithmetic number, because the mean of its divisors is an integer number (59674924192).

Almost surely, 2^231240331213 is an apocalyptic number.

It is an amenable number.

231240331213 is a deficient number, since it is larger than the sum of its proper divisors (7459365555).

231240331213 is an equidigital number, since it uses as much as digits as its factorization.

231240331213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7459365554.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 231240331213 its reverse (312133042132), we get a palindrome (543373373345).

The spelling of 231240331213 in words is "two hundred thirty-one billion, two hundred forty million, three hundred thirty-one thousand, two hundred thirteen".