15597 has 6 divisors (see below), whose sum is σ = 22542. Its totient is φ = 10392.

The previous prime is 15583. The next prime is 15601. The reversal of 15597 is 79551.

It can be written as a sum of positive squares in only one way, i.e., 12996 + 2601 = 114^2 + 51^2 .

It is not a de Polignac number, because 15597 - 2⁴ = 15581 is a prime.

15597 is a lucky number.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 15597.

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 15597.

It is not an unprimeable number, because it can be changed into a prime (15527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 858 + ... + 875.

It is an arithmetic number, because the mean of its divisors is an integer number (3757).

2¹⁵⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

15597 is a deficient number, since it is larger than the sum of its proper divisors (6945).

15597 is a wasteful number, since it uses less digits than its factorization.

15597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739 (or 1736 counting only the distinct ones).

The product of its digits is 1575, while the sum is 27.

The square root of 15597 is about 124.8879497790. The cubic root of 15597 is about 24.9850577376.

It can be divided in two parts, 155 and 97, that added together give a palindrome (252).

The spelling of 15597 in words is "fifteen thousand, five hundred ninety-seven".