13776809 has 2 divisors, whose sum is σ = 13776810. Its totient is φ = 13776808.

The previous prime is 13776799. The next prime is 13776821. The reversal of 13776809 is 90867731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7823209 + 5953600 = 2797^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 13776809 - 2¹⁶ = 13711273 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13776859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6888404 + 6888405.

It is an arithmetic number, because the mean of its divisors is an integer number (6888405).

Almost surely, 2^13776809 is an apocalyptic number.

It is an amenable number.

13776809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13776809 is an equidigital number, since it uses as much as digits as its factorization.

13776809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 13776809 is about 3711.7124080403. The cubic root of 13776809 is about 239.7265925884.

The spelling of 13776809 in words is "thirteen million, seven hundred seventy-six thousand, eight hundred nine".