15917 has 4 divisors (see below), whose sum is σ = 17376. Its totient is φ = 14460.

The previous prime is 15913. The next prime is 15919. The reversal of 15917 is 71951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15917 - 2² = 15913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15892 and 15901.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 15917.

It is not an unprimeable number, because it can be changed into a prime (15913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713 + ... + 734.

It is an arithmetic number, because the mean of its divisors is an integer number (4344).

2¹⁵⁹¹⁷ is an apocalyptic number.

It is an amenable number.

15917 is a deficient number, since it is larger than the sum of its proper divisors (1459).

15917 is a wasteful number, since it uses less digits than its factorization.

15917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458.

The product of its digits is 315, while the sum is 23.

The square root of 15917 is about 126.1625935054. The cubic root of 15917 is about 25.1547731666.

The spelling of 15917 in words is "fifteen thousand, nine hundred seventeen".