231323231213 has 2 divisors, whose sum is σ = 231323231214. Its totient is φ = 231323231212.

The previous prime is 231323231203. The next prime is 231323231273. The reversal of 231323231213 is 312132323132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132738534889 + 98584696324 = 364333^2 + 313982^2 .

It is a cyclic number.

It is not a de Polignac number, because 231323231213 - 2²⁴ = 231306453997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231323231203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115661615606 + 115661615607.

It is an arithmetic number, because the mean of its divisors is an integer number (115661615607).

Almost surely, 2^231323231213 is an apocalyptic number.

It is an amenable number.

231323231213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231323231213 is an equidigital number, since it uses as much as digits as its factorization.

231323231213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 26.

Adding to 231323231213 its reverse (312132323132), we get a palindrome (543455554345).

The spelling of 231323231213 in words is "two hundred thirty-one billion, three hundred twenty-three million, two hundred thirty-one thousand, two hundred thirteen".