6556009 has 4 divisors (see below), whose sum is σ = 6583680. Its totient is φ = 6528340.

The previous prime is 6556003. The next prime is 6556013. The reversal of 6556009 is 9006556.

It is a happy number.

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 6556009 - 2¹¹ = 6553961 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556003) 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, 13477 + ... + 13954.

It is an arithmetic number, because the mean of its divisors is an integer number (1645920).

Almost surely, 2^6556009 is an apocalyptic number.

It is an amenable number.

6556009 is a deficient number, since it is larger than the sum of its proper divisors (27671).

6556009 is a wasteful number, since it uses less digits than its factorization.

6556009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27670.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 6556009 is about 2560.4704645826. The cubic root of 6556009 is about 187.1600619898.

The spelling of 6556009 in words is "six million, five hundred fifty-six thousand, nine".