13809511621 has 16 divisors (see below), whose sum is σ = 14879393280. Its totient is φ = 12768537600.

The previous prime is 13809511601. The next prime is 13809511633. The reversal of 13809511621 is 12611590831.

It is a cyclic number.

It is not a de Polignac number, because 13809511621 - 2⁷ = 13809511493 is a prime.

It is a super-2 number, since 2×13809511621² (a number of 21 digits) 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 (13809511601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1953325 + ... + 1960381.

It is an arithmetic number, because the mean of its divisors is an integer number (929962080).

Almost surely, 2^13809511621 is an apocalyptic number.

It is an amenable number.

13809511621 is a deficient number, since it is larger than the sum of its proper divisors (1069881659).

13809511621 is a wasteful number, since it uses less digits than its factorization.

13809511621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9084.

The product of its (nonzero) digits is 12960, while the sum is 37.

The spelling of 13809511621 in words is "thirteen billion, eight hundred nine million, five hundred eleven thousand, six hundred twenty-one".