31310230997 has 2 divisors, whose sum is σ = 31310230998. Its totient is φ = 31310230996.

The previous prime is 31310230949. The next prime is 31310231003. The reversal of 31310230997 is 79903201313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26282570161 + 5027660836 = 162119^2 + 70906^2 .

It is a cyclic number.

It is not a de Polignac number, because 31310230997 - 2²⁶ = 31243122133 is a prime.

It is a super-2 number, since 2×31310230997² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31310230997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31310230927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655115498 + 15655115499.

It is an arithmetic number, because the mean of its divisors is an integer number (15655115499).

Almost surely, 2^31310230997 is an apocalyptic number.

It is an amenable number.

31310230997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310230997 is an equidigital number, since it uses as much as digits as its factorization.

31310230997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 38.

The spelling of 31310230997 in words is "thirty-one billion, three hundred ten million, two hundred thirty thousand, nine hundred ninety-seven".