13680809 has 2 divisors, whose sum is σ = 13680810. Its totient is φ = 13680808.

The previous prime is 13680773. The next prime is 13680829. The reversal of 13680809 is 90808631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13344409 + 336400 = 3653^2 + 580^2 .

It is an emirp because it is prime and its reverse (90808631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13680809 - 2⁸ = 13680553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13680829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6840404 + 6840405.

It is an arithmetic number, because the mean of its divisors is an integer number (6840405).

Almost surely, 2^13680809 is an apocalyptic number.

It is an amenable number.

13680809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13680809 is an equidigital number, since it uses as much as digits as its factorization.

13680809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 13680809 is about 3698.7577644393. The cubic root of 13680809 is about 239.1684707029.

The spelling of 13680809 in words is "thirteen million, six hundred eighty thousand, eight hundred nine".