8581009 has 4 divisors (see below), whose sum is σ = 8648704. Its totient is φ = 8513316.

The previous prime is 8581007. The next prime is 8581021. The reversal of 8581009 is 9001858.

8581009 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.

It is a cyclic number.

It is not a de Polignac number, because 8581009 - 2¹ = 8581007 is a prime.

It is a Duffinian number.

8581009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8581007) 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, 33657 + ... + 33910.

It is an arithmetic number, because the mean of its divisors is an integer number (2162176).

Almost surely, 2^8581009 is an apocalyptic number.

It is an amenable number.

8581009 is a deficient number, since it is larger than the sum of its proper divisors (67695).

8581009 is a wasteful number, since it uses less digits than its factorization.

8581009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67694.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 8581009 is about 2929.3359315722. The cubic root of 8581009 is about 204.7290411851.

The spelling of 8581009 in words is "eight million, five hundred eighty-one thousand, nine".