13617691 has 6 divisors (see below), whose sum is σ = 13759620. Its totient is φ = 13476528.

The previous prime is 13617689. The next prime is 13617707. The reversal of 13617691 is 19671631.

It is not a de Polignac number, because 13617691 - 2¹ = 13617689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13617601) 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, 43351 + ... + 43663.

It is an arithmetic number, because the mean of its divisors is an integer number (2293270).

Almost surely, 2^13617691 is an apocalyptic number.

13617691 is a deficient number, since it is larger than the sum of its proper divisors (141929).

13617691 is an frugal number, since it uses more digits than its factorization.

13617691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765 (or 452 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 13617691 is about 3690.2155763586. The cubic root of 13617691 is about 238.8000931046.

The spelling of 13617691 in words is "thirteen million, six hundred seventeen thousand, six hundred ninety-one".