231131222332313 has 4 divisors (see below), whose sum is σ = 231645991202100. Its totient is φ = 230616453462528.

The previous prime is 231131222332291. The next prime is 231131222332337. The reversal of 231131222332313 is 313233222131132.

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 197265480085129 + 33865742247184 = 14045123^2 + 5819428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231131222332313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231131222332313.

It is not an unprimeable number, because it can be changed into a prime (231131222331313) 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, 257384434220 + ... + 257384435117.

It is an arithmetic number, because the mean of its divisors is an integer number (57911497800525).

Almost surely, 2^{231131222332313} is an apocalyptic number.

It is an amenable number.

231131222332313 is a deficient number, since it is larger than the sum of its proper divisors (514768869787).

231131222332313 is an equidigital number, since it uses as much as digits as its factorization.

231131222332313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514768869786.

The product of its digits is 23328, while the sum is 32.

Adding to 231131222332313 its reverse (313233222131132), we get a palindrome (544364444463445).

The spelling of 231131222332313 in words is "two hundred thirty-one trillion, one hundred thirty-one billion, two hundred twenty-two million, three hundred thirty-two thousand, three hundred thirteen".