231310031213 has 2 divisors, whose sum is σ = 231310031214. Its totient is φ = 231310031212.

The previous prime is 231310031207. The next prime is 231310031231. The reversal of 231310031213 is 312130013132.

Together with next prime (231310031231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205555237924 + 25754793289 = 453382^2 + 160483^2 .

It is a cyclic number.

It is not a de Polignac number, because 231310031213 - 2³⁰ = 230236289389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231310031273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655015606 + 115655015607.

It is an arithmetic number, because the mean of its divisors is an integer number (115655015607).

Almost surely, 2^231310031213 is an apocalyptic number.

It is an amenable number.

231310031213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231310031213 is an equidigital number, since it uses as much as digits as its factorization.

231310031213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 231310031213 its reverse (312130013132), we get a palindrome (543440044345).

The spelling of 231310031213 in words is "two hundred thirty-one billion, three hundred ten million, thirty-one thousand, two hundred thirteen".