13661817 has 32 divisors (see below), whose sum is σ = 20966400. Its totient is φ = 7843392.

The previous prime is 13661803. The next prime is 13661833. The reversal of 13661817 is 71816631.

13661817 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13661817 - 2⁷ = 13661689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13661017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76234 + ... + 76412.

It is an arithmetic number, because the mean of its divisors is an integer number (655200).

Almost surely, 2^13661817 is an apocalyptic number.

It is an amenable number.

13661817 is a deficient number, since it is larger than the sum of its proper divisors (7304583).

13661817 is a wasteful number, since it uses less digits than its factorization.

13661817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317.

The product of its digits is 6048, while the sum is 33.

The square root of 13661817 is about 3696.1895243615. The cubic root of 13661817 is about 239.0577464730.

The spelling of 13661817 in words is "thirteen million, six hundred sixty-one thousand, eight hundred seventeen".