31663925317 has 2 divisors, whose sum is σ = 31663925318. Its totient is φ = 31663925316.

The previous prime is 31663925221. The next prime is 31663925327. The reversal of 31663925317 is 71352936613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25727839201 + 5936086116 = 160399^2 + 77046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31663925317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31663925327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15831962658 + 15831962659.

It is an arithmetic number, because the mean of its divisors is an integer number (15831962659).

Almost surely, 2^31663925317 is an apocalyptic number.

It is an amenable number.

31663925317 is a deficient number, since it is larger than the sum of its proper divisors (1).

31663925317 is an equidigital number, since it uses as much as digits as its factorization.

31663925317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 46.

The spelling of 31663925317 in words is "thirty-one billion, six hundred sixty-three million, nine hundred twenty-five thousand, three hundred seventeen".