31712808913 has 2 divisors, whose sum is σ = 31712808914. Its totient is φ = 31712808912.

The previous prime is 31712808889. The next prime is 31712808923. The reversal of 31712808913 is 31980821713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28298977729 + 3413831184 = 168223^2 + 58428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31712808913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31712808913.

It is not a weakly prime, because it can be changed into another prime (31712808923) 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, 15856404456 + 15856404457.

It is an arithmetic number, because the mean of its divisors is an integer number (15856404457).

Almost surely, 2^31712808913 is an apocalyptic number.

It is an amenable number.

31712808913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31712808913 is an equidigital number, since it uses as much as digits as its factorization.

31712808913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 31712808913 in words is "thirty-one billion, seven hundred twelve million, eight hundred eight thousand, nine hundred thirteen".