13617899 has 4 divisors (see below), whose sum is σ = 13625664. Its totient is φ = 13610136.

The previous prime is 13617881. The next prime is 13617911. The reversal of 13617899 is 99871631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13617899 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (13617839) 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, 134 + ... + 5220.

It is an arithmetic number, because the mean of its divisors is an integer number (3406416).

Almost surely, 2^13617899 is an apocalyptic number.

13617899 is a deficient number, since it is larger than the sum of its proper divisors (7765).

13617899 is an equidigital number, since it uses as much as digits as its factorization.

13617899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7764.

The product of its digits is 81648, while the sum is 44.

The square root of 13617899 is about 3690.2437588864. The cubic root of 13617899 is about 238.8013089291.

The spelling of 13617899 in words is "thirteen million, six hundred seventeen thousand, eight hundred ninety-nine".