231313223117 has 2 divisors, whose sum is σ = 231313223118. Its totient is φ = 231313223116.

The previous prime is 231313223093. The next prime is 231313223137. The reversal of 231313223117 is 711322313132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215248674601 + 16064548516 = 463949^2 + 126746^2 .

It is a cyclic number.

It is not a de Polignac number, because 231313223117 - 2²⁸ = 231044787661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231313223117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231313223137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656611558 + 115656611559.

It is an arithmetic number, because the mean of its divisors is an integer number (115656611559).

Almost surely, 2^231313223117 is an apocalyptic number.

It is an amenable number.

231313223117 is a deficient number, since it is larger than the sum of its proper divisors (1).

231313223117 is an equidigital number, since it uses as much as digits as its factorization.

231313223117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

Adding to 231313223117 its reverse (711322313132), we get a palindrome (942635536249).

The spelling of 231313223117 in words is "two hundred thirty-one billion, three hundred thirteen million, two hundred twenty-three thousand, one hundred seventeen".