13966591 has 4 divisors (see below), whose sum is σ = 13987000. Its totient is φ = 13946184.

The previous prime is 13966573. The next prime is 13966597. The reversal of 13966591 is 19566931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19566931 = 3851 ⋅5081.

It is a cyclic number.

It is not a de Polignac number, because 13966591 - 2¹⁵ = 13933823 is a prime.

It is a super-2 number, since 2×13966591² = 390131328322562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13966597) 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, 9141 + ... + 10558.

It is an arithmetic number, because the mean of its divisors is an integer number (3496750).

Almost surely, 2^13966591 is an apocalyptic number.

13966591 is a deficient number, since it is larger than the sum of its proper divisors (20409).

13966591 is an equidigital number, since it uses as much as digits as its factorization.

13966591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20408.

The product of its digits is 43740, while the sum is 40.

The square root of 13966591 is about 3737.1902547235. The cubic root of 13966591 is about 240.8223583744.

The spelling of 13966591 in words is "thirteen million, nine hundred sixty-six thousand, five hundred ninety-one".