13815804209 has 2 divisors, whose sum is σ = 13815804210. Its totient is φ = 13815804208.

The previous prime is 13815804179. The next prime is 13815804253. The reversal of 13815804209 is 90240851831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9916176400 + 3899627809 = 99580^2 + 62447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13815804209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13815804269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6907902104 + 6907902105.

It is an arithmetic number, because the mean of its divisors is an integer number (6907902105).

Almost surely, 2^13815804209 is an apocalyptic number.

It is an amenable number.

13815804209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13815804209 is an equidigital number, since it uses as much as digits as its factorization.

13815804209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 13815804209 in words is "thirteen billion, eight hundred fifteen million, eight hundred four thousand, two hundred nine".