13166691 has 4 divisors (see below), whose sum is σ = 17555592. Its totient is φ = 8777792.

The previous prime is 13166669. The next prime is 13166701. The reversal of 13166691 is 19666131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19666131 = 3 ⋅6555377.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13166691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13166591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2194446 + ... + 2194451.

It is an arithmetic number, because the mean of its divisors is an integer number (4388898).

Almost surely, 2^13166691 is an apocalyptic number.

13166691 is a deficient number, since it is larger than the sum of its proper divisors (4388901).

13166691 is an equidigital number, since it uses as much as digits as its factorization.

13166691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388900.

The product of its digits is 5832, while the sum is 33.

The square root of 13166691 is about 3628.5935291790. The cubic root of 13166691 is about 236.1341942441.

The spelling of 13166691 in words is "thirteen million, one hundred sixty-six thousand, six hundred ninety-one".