231113122031213 has 4 divisors (see below), whose sum is σ = 231203506516380. Its totient is φ = 231022737546048.

The previous prime is 231113122031201. The next prime is 231113122031227. The reversal of 231113122031213 is 312130221311132.

231113122031213 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.

It can be written as a sum of positive squares in 2 ways, for example, as 59909426653924 + 171203695377289 = 7740118^2 + 13084483^2 .

It is a cyclic number.

It is not a de Polignac number, because 231113122031213 - 2⁴⁴ = 213520935986797 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 (231113122031263) 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, 45192238748 + ... + 45192243861.

It is an arithmetic number, because the mean of its divisors is an integer number (57800876629095).

Almost surely, 2^{231113122031213} is an apocalyptic number.

It is an amenable number.

231113122031213 is a deficient number, since it is larger than the sum of its proper divisors (90384485167).

231113122031213 is an equidigital number, since it uses as much as digits as its factorization.

231113122031213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90384485166.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 231113122031213 its reverse (312130221311132), we get a palindrome (543243343342345).

The spelling of 231113122031213 in words is "two hundred thirty-one trillion, one hundred thirteen billion, one hundred twenty-two million, thirty-one thousand, two hundred thirteen".