13012809 has 16 divisors (see below), whose sum is σ = 17740800. Its totient is φ = 8482320.

The previous prime is 13012799. The next prime is 13012849. The reversal of 13012809 is 90821031.

13012809 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13012809 - 2⁸ = 13012553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13012849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42234 + ... + 42540.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^13012809 is an apocalyptic number.

It is an amenable number.

13012809 is a deficient number, since it is larger than the sum of its proper divisors (4727991).

13012809 is a wasteful number, since it uses less digits than its factorization.

13012809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 13012809 is about 3607.3271268350. The cubic root of 13012809 is about 235.2106696939.

The spelling of 13012809 in words is "thirteen million, twelve thousand, eight hundred nine".