13820001809 has 2 divisors, whose sum is σ = 13820001810. Its totient is φ = 13820001808.

The previous prime is 13820001787. The next prime is 13820001857. The reversal of 13820001809 is 90810002831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8827166209 + 4992835600 = 93953^2 + 70660^2 .

It is a cyclic number.

It is not a de Polignac number, because 13820001809 - 2⁸ = 13820001553 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 (13820001869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6910000904 + 6910000905.

It is an arithmetic number, because the mean of its divisors is an integer number (6910000905).

Almost surely, 2^13820001809 is an apocalyptic number.

It is an amenable number.

13820001809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13820001809 is an equidigital number, since it uses as much as digits as its factorization.

13820001809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 13820001809 in words is "thirteen billion, eight hundred twenty million, one thousand, eight hundred nine".