13947506917 has 2 divisors, whose sum is σ = 13947506918. Its totient is φ = 13947506916.

The previous prime is 13947506899. The next prime is 13947506927. The reversal of 13947506917 is 71960574931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13776655876 + 170851041 = 117374^2 + 13071^2 .

It is a cyclic number.

It is not a de Polignac number, because 13947506917 - 2³¹ = 11800023269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13947506927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6973753458 + 6973753459.

It is an arithmetic number, because the mean of its divisors is an integer number (6973753459).

Almost surely, 2^13947506917 is an apocalyptic number.

It is an amenable number.

13947506917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13947506917 is an equidigital number, since it uses as much as digits as its factorization.

13947506917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The spelling of 13947506917 in words is "thirteen billion, nine hundred forty-seven million, five hundred six thousand, nine hundred seventeen".