2566009 has 4 divisors (see below), whose sum is σ = 2569216. Its totient is φ = 2562804.

The previous prime is 2566001. The next prime is 2566013. The reversal of 2566009 is 9006652.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2566009 - 2³ = 2566001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2566001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712 + ... + 2374.

It is an arithmetic number, because the mean of its divisors is an integer number (642304).

2^2566009 is an apocalyptic number.

It is an amenable number.

2566009 is a deficient number, since it is larger than the sum of its proper divisors (3207).

2566009 is a wasteful number, since it uses less digits than its factorization.

2566009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 2566009 is about 1601.8767118602. The cubic root of 2566009 is about 136.9050259045.

The spelling of 2566009 in words is "two million, five hundred sixty-six thousand, nine".