13815091 has 4 divisors (see below), whose sum is σ = 13944312. Its totient is φ = 13685872.

The previous prime is 13815079. The next prime is 13815149. The reversal of 13815091 is 19051831.

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 13815091 - 2⁵ = 13815059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13815001) 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 3 ways as a sum of consecutive naturals, for example, 64450 + ... + 64663.

It is an arithmetic number, because the mean of its divisors is an integer number (3486078).

Almost surely, 2^13815091 is an apocalyptic number.

13815091 is a deficient number, since it is larger than the sum of its proper divisors (129221).

13815091 is a wasteful number, since it uses less digits than its factorization.

13815091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129220.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 13815091 is about 3716.8657495261. The cubic root of 13815091 is about 239.9484322077.

The spelling of 13815091 in words is "thirteen million, eight hundred fifteen thousand, ninety-one".