31310311231 has 2 divisors, whose sum is σ = 31310311232. Its totient is φ = 31310311230.

The previous prime is 31310311189. The next prime is 31310311247. The reversal of 31310311231 is 13211301313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31310311231 - 2⁹ = 31310310719 is a prime.

It is a super-2 number, since 2×31310311231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31310311199 and 31310311208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31310611231) 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, 15655155615 + 15655155616.

It is an arithmetic number, because the mean of its divisors is an integer number (15655155616).

Almost surely, 2^31310311231 is an apocalyptic number.

31310311231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310311231 is an equidigital number, since it uses as much as digits as its factorization.

31310311231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31310311231 its reverse (13211301313), we get a palindrome (44521612544).

The spelling of 31310311231 in words is "thirty-one billion, three hundred ten million, three hundred eleven thousand, two hundred thirty-one".