13897591 has 4 divisors (see below), whose sum is σ = 13909752. Its totient is φ = 13885432.

The previous prime is 13897577. The next prime is 13897613. The reversal of 13897591 is 19579831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19579831 = 23 ⋅851297.

It is a cyclic number.

It is not a de Polignac number, because 13897591 - 2⁷ = 13897463 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 (13897511) 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, 4165 + ... + 6718.

It is an arithmetic number, because the mean of its divisors is an integer number (3477438).

Almost surely, 2^13897591 is an apocalyptic number.

13897591 is a deficient number, since it is larger than the sum of its proper divisors (12161).

13897591 is a wasteful number, since it uses less digits than its factorization.

13897591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12160.

The product of its digits is 68040, while the sum is 43.

The square root of 13897591 is about 3727.9472903999. The cubic root of 13897591 is about 240.4251203674.

The spelling of 13897591 in words is "thirteen million, eight hundred ninety-seven thousand, five hundred ninety-one".