13809191 has 16 divisors (see below), whose sum is σ = 15824160. Its totient is φ = 11934720.

The previous prime is 13809179. The next prime is 13809209. The reversal of 13809191 is 19190831.

It is a cyclic number.

It is not a de Polignac number, because 13809191 - 2¹⁰ = 13808167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13809161) 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 15 ways as a sum of consecutive naturals, for example, 22991 + ... + 23583.

It is an arithmetic number, because the mean of its divisors is an integer number (989010).

Almost surely, 2^13809191 is an apocalyptic number.

13809191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13809191 is a deficient number, since it is larger than the sum of its proper divisors (2014969).

13809191 is a wasteful number, since it uses less digits than its factorization.

13809191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 13809191 is about 3716.0719853092. The cubic root of 13809191 is about 239.9142691481.

The spelling of 13809191 in words is "thirteen million, eight hundred nine thousand, one hundred ninety-one".