13615 has 8 divisors (see below), whose sum is σ = 18720. Its totient is φ = 9312.

The previous prime is 13613. The next prime is 13619. The reversal of 13615 is 51631.

13615 = T₂₅ + T₂₆ + ... + T₄₅.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13615 - 2¹ = 13613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160 + ... + 229.

It is an arithmetic number, because the mean of its divisors is an integer number (2340).

2¹³⁶¹⁵ is an apocalyptic number.

13615 is a deficient number, since it is larger than the sum of its proper divisors (5105).

13615 is an equidigital number, since it uses as much as digits as its factorization.

13615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401.

The product of its digits is 90, while the sum is 16.

The square root of 13615 is about 116.6833321430. The cubic root of 13615 is about 23.8784362259.

Adding to 13615 its sum of digits (16), we get a palindrome (13631).

It can be divided in two parts, 136 and 15, that added together give a palindrome (151).

The spelling of 13615 in words is "thirteen thousand, six hundred fifteen".