13001809 has 4 divisors (see below), whose sum is σ = 13009716. Its totient is φ = 12993904.

The previous prime is 13001789. The next prime is 13001827. The reversal of 13001809 is 90810031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2131600 + 10870209 = 1460^2 + 3297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13001809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13001809.

It is not an unprimeable number, because it can be changed into a prime (13002809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454 + ... + 5119.

It is an arithmetic number, because the mean of its divisors is an integer number (3252429).

Almost surely, 2^13001809 is an apocalyptic number.

It is an amenable number.

13001809 is a deficient number, since it is larger than the sum of its proper divisors (7907).

13001809 is an equidigital number, since it uses as much as digits as its factorization.

13001809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7906.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 13001809 is about 3605.8021299012. The cubic root of 13001809 is about 235.1443748417.

The spelling of 13001809 in words is "thirteen million, one thousand, eight hundred nine".