13812109 has 4 divisors (see below), whose sum is σ = 14624604. Its totient is φ = 12999616.

The previous prime is 13812101. The next prime is 13812157. The reversal of 13812109 is 90121831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12802084 + 1010025 = 3578^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 13812109 - 2³ = 13812101 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 (13812101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406222 + ... + 406255.

It is an arithmetic number, because the mean of its divisors is an integer number (3656151).

Almost surely, 2^13812109 is an apocalyptic number.

It is an amenable number.

13812109 is a deficient number, since it is larger than the sum of its proper divisors (812495).

13812109 is an equidigital number, since it uses as much as digits as its factorization.

13812109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812494.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 13812109 is about 3716.4645834449. The cubic root of 13812109 is about 239.9311666027.

The spelling of 13812109 in words is "thirteen million, eight hundred twelve thousand, one hundred nine".