13578009 has 4 divisors (see below), whose sum is σ = 18104016. Its totient is φ = 9052004.

The previous prime is 13578007. The next prime is 13578013. The reversal of 13578009 is 90087531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13578009 - 2¹ = 13578007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13578007) 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, 2262999 + ... + 2263004.

It is an arithmetic number, because the mean of its divisors is an integer number (4526004).

Almost surely, 2^13578009 is an apocalyptic number.

It is an amenable number.

13578009 is a deficient number, since it is larger than the sum of its proper divisors (4526007).

13578009 is an equidigital number, since it uses as much as digits as its factorization.

13578009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4526006.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 13578009 is about 3684.8350030904. The cubic root of 13578009 is about 238.5679126600.

The spelling of 13578009 in words is "thirteen million, five hundred seventy-eight thousand, nine".