13545809 has 4 divisors (see below), whose sum is σ = 13559616. Its totient is φ = 13532004.

The previous prime is 13545799. The next prime is 13545907. The reversal of 13545809 is 90854531.

13545809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90854531 = 23 ⋅3950197.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13545809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13545709) 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, 5309 + ... + 7434.

It is an arithmetic number, because the mean of its divisors is an integer number (3389904).

Almost surely, 2^13545809 is an apocalyptic number.

It is an amenable number.

13545809 is a deficient number, since it is larger than the sum of its proper divisors (13807).

13545809 is a wasteful number, since it uses less digits than its factorization.

13545809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13806.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 13545809 is about 3680.4631502027. The cubic root of 13545809 is about 238.3791769063.

The spelling of 13545809 in words is "thirteen million, five hundred forty-five thousand, eight hundred nine".