13697591 has 4 divisors (see below), whose sum is σ = 13706784. Its totient is φ = 13688400.

The previous prime is 13697587. The next prime is 13697603. The reversal of 13697591 is 19579631.

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 not a de Polignac number, because 13697591 - 2² = 13697587 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 (13697531) 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, 1790 + ... + 5531.

It is an arithmetic number, because the mean of its divisors is an integer number (3426696).

Almost surely, 2^13697591 is an apocalyptic number.

13697591 is a deficient number, since it is larger than the sum of its proper divisors (9193).

13697591 is an equidigital number, since it uses as much as digits as its factorization.

13697591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9192.

The product of its digits is 51030, while the sum is 41.

The square root of 13697591 is about 3701.0256686492. The cubic root of 13697591 is about 239.2662252826.

The spelling of 13697591 in words is "thirteen million, six hundred ninety-seven thousand, five hundred ninety-one".