13809511 has 4 divisors (see below), whose sum is σ = 13909000. Its totient is φ = 13710024.

The previous prime is 13809487. The next prime is 13809517. The reversal of 13809511 is 11590831.

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 13809511 - 2⁵ = 13809479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13809511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13809517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49536 + ... + 49813.

It is an arithmetic number, because the mean of its divisors is an integer number (3477250).

Almost surely, 2^13809511 is an apocalyptic number.

13809511 is the 2146-th hex number.

13809511 is a deficient number, since it is larger than the sum of its proper divisors (99489).

13809511 is an equidigital number, since it uses as much as digits as its factorization.

13809511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99488.

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

The square root of 13809511 is about 3716.1150412763. The cubic root of 13809511 is about 239.9161223093.

The spelling of 13809511 in words is "thirteen million, eight hundred nine thousand, five hundred eleven".