31831688613313 has 2 divisors, whose sum is σ = 31831688613314. Its totient is φ = 31831688613312.

The previous prime is 31831688613293. The next prime is 31831688613317. The reversal of 31831688613313 is 31331688613813.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26298312163344 + 5533376449969 = 5128188^2 + 2352313^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31831688613313 is a prime.

It is not a weakly prime, because it can be changed into another prime (31831688613317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15915844306656 + 15915844306657.

It is an arithmetic number, because the mean of its divisors is an integer number (15915844306657).

Almost surely, 2^{31831688613313} is an apocalyptic number.

It is an amenable number.

31831688613313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31831688613313 is an equidigital number, since it uses as much as digits as its factorization.

31831688613313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 55.

The spelling of 31831688613313 in words is "thirty-one trillion, eight hundred thirty-one billion, six hundred eighty-eight million, six hundred thirteen thousand, three hundred thirteen".