13809181 has 8 divisors (see below), whose sum is σ = 14601600. Its totient is φ = 13023360.

The previous prime is 13809179. The next prime is 13809209. The reversal of 13809181 is 18190831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13809181 - 2¹ = 13809179 is a prime.

It is a super-2 number, since 2×13809181² = 381386959781522, 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 (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 7 ways as a sum of consecutive naturals, for example, 3021 + ... + 6061.

It is an arithmetic number, because the mean of its divisors is an integer number (1825200).

Almost surely, 2^13809181 is an apocalyptic number.

It is an amenable number.

13809181 is a deficient number, since it is larger than the sum of its proper divisors (792419).

13809181 is a wasteful number, since it uses less digits than its factorization.

13809181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3299.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 13809181 is about 3716.0706398022. The cubic root of 13809181 is about 239.9142112363.

The spelling of 13809181 in words is "thirteen million, eight hundred nine thousand, one hundred eighty-one".