13530809 has 2 divisors, whose sum is σ = 13530810. Its totient is φ = 13530808.

The previous prime is 13530763. The next prime is 13530823. The reversal of 13530809 is 90803531.

13530809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13104400 + 426409 = 3620^2 + 653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13530809 is a prime.

It is not a weakly prime, because it can be changed into another prime (13530889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765404 + 6765405.

It is an arithmetic number, because the mean of its divisors is an integer number (6765405).

Almost surely, 2^13530809 is an apocalyptic number.

It is an amenable number.

13530809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13530809 is an equidigital number, since it uses as much as digits as its factorization.

13530809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 13530809 is about 3678.4247987420. The cubic root of 13530809 is about 238.2911543965.

The spelling of 13530809 in words is "thirteen million, five hundred thirty thousand, eight hundred nine".