8555009 has 4 divisors (see below), whose sum is σ = 8560980. Its totient is φ = 8549040.

The previous prime is 8554999. The next prime is 8555021. The reversal of 8555009 is 9005558.

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 4963984 + 3591025 = 2228^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 8555009 - 2⁴ = 8554993 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 (8555809) 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, 599 + ... + 4179.

It is an arithmetic number, because the mean of its divisors is an integer number (2140245).

Almost surely, 2^8555009 is an apocalyptic number.

It is an amenable number.

8555009 is a deficient number, since it is larger than the sum of its proper divisors (5971).

8555009 is a wasteful number, since it uses less digits than its factorization.

8555009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5970.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 8555009 is about 2924.8946989593. The cubic root of 8555009 is about 204.5220593010.

The spelling of 8555009 in words is "eight million, five hundred fifty-five thousand, nine".