13681597 has 4 divisors (see below), whose sum is σ = 13693276. Its totient is φ = 13669920.

The previous prime is 13681589. The next prime is 13681621. The reversal of 13681597 is 79518631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10169721 + 3511876 = 3189^2 + 1874^2 .

It is a cyclic number.

It is not a de Polignac number, because 13681597 - 2³ = 13681589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13681537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3858 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (3423319).

Almost surely, 2^13681597 is an apocalyptic number.

It is an amenable number.

13681597 is a deficient number, since it is larger than the sum of its proper divisors (11679).

13681597 is a wasteful number, since it uses less digits than its factorization.

13681597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11678.

The product of its digits is 45360, while the sum is 40.

The square root of 13681597 is about 3698.8642851556. The cubic root of 13681597 is about 239.1730625643.

The spelling of 13681597 in words is "thirteen million, six hundred eighty-one thousand, five hundred ninety-seven".