13689591 has 4 divisors (see below), whose sum is σ = 18252792. Its totient is φ = 9126392.

The previous prime is 13689589. The next prime is 13689601. The reversal of 13689591 is 19598631.

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

It is a cyclic number.

It is not a de Polignac number, because 13689591 - 2¹ = 13689589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13689541) 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, 2281596 + ... + 2281601.

It is an arithmetic number, because the mean of its divisors is an integer number (4563198).

Almost surely, 2^13689591 is an apocalyptic number.

13689591 is a deficient number, since it is larger than the sum of its proper divisors (4563201).

13689591 is an equidigital number, since it uses as much as digits as its factorization.

13689591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563200.

The product of its digits is 58320, while the sum is 42.

The square root of 13689591 is about 3699.9447293169. The cubic root of 13689591 is about 239.2196355193.

The spelling of 13689591 in words is "thirteen million, six hundred eighty-nine thousand, five hundred ninety-one".