231313121317 has 2 divisors, whose sum is σ = 231313121318. Its totient is φ = 231313121316.

The previous prime is 231313121309. The next prime is 231313121387. The reversal of 231313121317 is 713121313132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126600044481 + 104713076836 = 355809^2 + 323594^2 .

It is a cyclic number.

It is not a de Polignac number, because 231313121317 - 2³ = 231313121309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231313121387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656560658 + 115656560659.

It is an arithmetic number, because the mean of its divisors is an integer number (115656560659).

Almost surely, 2^231313121317 is an apocalyptic number.

It is an amenable number.

231313121317 is a deficient number, since it is larger than the sum of its proper divisors (1).

231313121317 is an equidigital number, since it uses as much as digits as its factorization.

231313121317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 28.

Adding to 231313121317 its reverse (713121313132), we get a palindrome (944434434449).

The spelling of 231313121317 in words is "two hundred thirty-one billion, three hundred thirteen million, one hundred twenty-one thousand, three hundred seventeen".