231313212331 has 2 divisors, whose sum is σ = 231313212332. Its totient is φ = 231313212330.

The previous prime is 231313212283. The next prime is 231313212397. The reversal of 231313212331 is 133212313132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231313212331 - 2¹⁵ = 231313179563 is a prime.

It is a super-2 number, since 2×231313212331² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231313212296 and 231313212305.

It is not a weakly prime, because it can be changed into another prime (231313012331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656606165 + 115656606166.

It is an arithmetic number, because the mean of its divisors is an integer number (115656606166).

Almost surely, 2^231313212331 is an apocalyptic number.

231313212331 is a deficient number, since it is larger than the sum of its proper divisors (1).

231313212331 is an equidigital number, since it uses as much as digits as its factorization.

231313212331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 25.

Adding to 231313212331 its reverse (133212313132), we get a palindrome (364525525463).

The spelling of 231313212331 in words is "two hundred thirty-one billion, three hundred thirteen million, two hundred twelve thousand, three hundred thirty-one".