13818109 has 2 divisors, whose sum is σ = 13818110. Its totient is φ = 13818108.

The previous prime is 13818071. The next prime is 13818137. The reversal of 13818109 is 90181831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6943225 + 6874884 = 2635^2 + 2622^2 .

It is a cyclic number.

It is not a de Polignac number, because 13818109 - 2⁹ = 13817597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13818139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6909054 + 6909055.

It is an arithmetic number, because the mean of its divisors is an integer number (6909055).

Almost surely, 2^13818109 is an apocalyptic number.

It is an amenable number.

13818109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13818109 is an equidigital number, since it uses as much as digits as its factorization.

13818109 is an odious number, because the sum of its binary digits is odd.

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

The square root of 13818109 is about 3717.2717145778. The cubic root of 13818109 is about 239.9659037211.

The spelling of 13818109 in words is "thirteen million, eight hundred eighteen thousand, one hundred nine".