15939316397 has 4 divisors (see below), whose sum is σ = 15939805980. Its totient is φ = 15938826816.

The previous prime is 15939316387. The next prime is 15939316417. The reversal of 15939316397 is 79361393951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79361393951 = 7 ⋅11337341993.

It can be written as a sum of positive squares in 2 ways, for example, as 13467834601 + 2471481796 = 116051^2 + 49714^2 .

It is a cyclic number.

It is not a de Polignac number, because 15939316397 - 2²⁸ = 15670880941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15939316307) 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 in 3 ways as a sum of consecutive naturals, for example, 192188 + ... + 262325.

It is an arithmetic number, because the mean of its divisors is an integer number (3984951495).

Almost surely, 2^15939316397 is an apocalyptic number.

It is an amenable number.

15939316397 is a deficient number, since it is larger than the sum of its proper divisors (489583).

15939316397 is an equidigital number, since it uses as much as digits as its factorization.

15939316397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489582.

The product of its digits is 4133430, while the sum is 56.

The spelling of 15939316397 in words is "fifteen billion, nine hundred thirty-nine million, three hundred sixteen thousand, three hundred ninety-seven".