13811899109 has 4 divisors (see below), whose sum is σ = 13978307616. Its totient is φ = 13645490604.

The previous prime is 13811899103. The next prime is 13811899133. The reversal of 13811899109 is 90199811831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13811899109 - 2⁴ = 13811899093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13811899103) 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, 83204129 + ... + 83204294.

It is an arithmetic number, because the mean of its divisors is an integer number (3494576904).

Almost surely, 2^13811899109 is an apocalyptic number.

It is an amenable number.

13811899109 is a deficient number, since it is larger than the sum of its proper divisors (166408507).

13811899109 is an equidigital number, since it uses as much as digits as its factorization.

13811899109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166408506.

The product of its (nonzero) digits is 139968, while the sum is 50.

The spelling of 13811899109 in words is "thirteen billion, eight hundred eleven million, eight hundred ninety-nine thousand, one hundred nine".