31994019313 has 2 divisors, whose sum is σ = 31994019314. Its totient is φ = 31994019312.

The previous prime is 31994019311. The next prime is 31994019349. The reversal of 31994019313 is 31391049913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25667884944 + 6326134369 = 160212^2 + 79537^2 .

It is a cyclic number.

It is not a de Polignac number, because 31994019313 - 2¹ = 31994019311 is a prime.

Together with 31994019311, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31994019313.

It is not a weakly prime, because it can be changed into another prime (31994019311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15997009656 + 15997009657.

It is an arithmetic number, because the mean of its divisors is an integer number (15997009657).

Almost surely, 2^31994019313 is an apocalyptic number.

It is an amenable number.

31994019313 is a deficient number, since it is larger than the sum of its proper divisors (1).

31994019313 is an equidigital number, since it uses as much as digits as its factorization.

31994019313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 43.

The spelling of 31994019313 in words is "thirty-one billion, nine hundred ninety-four million, nineteen thousand, three hundred thirteen".