13020809 has 2 divisors, whose sum is σ = 13020810. Its totient is φ = 13020808.

The previous prime is 13020803. The next prime is 13020853. The reversal of 13020809 is 90802031.

13020809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 2393209 = 3260^2 + 1547^2 .

It is a cyclic number.

It is not a de Polignac number, because 13020809 - 2¹⁶ = 12955273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13020803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6510404 + 6510405.

It is an arithmetic number, because the mean of its divisors is an integer number (6510405).

Almost surely, 2^13020809 is an apocalyptic number.

It is an amenable number.

13020809 is a deficient number, since it is larger than the sum of its proper divisors (1).

13020809 is an equidigital number, since it uses as much as digits as its factorization.

13020809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 13020809 is about 3608.4358107080. The cubic root of 13020809 is about 235.2588606695.

The spelling of 13020809 in words is "thirteen million, twenty thousand, eight hundred nine".