6557009 has 4 divisors (see below), whose sum is σ = 6576804. Its totient is φ = 6537216.

The previous prime is 6557003. The next prime is 6557041. The reversal of 6557009 is 9007556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3598609 + 2958400 = 1897^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557009 - 2⁴ = 6556993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6557003) 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, 9392 + ... + 10065.

It is an arithmetic number, because the mean of its divisors is an integer number (1644201).

Almost surely, 2^6557009 is an apocalyptic number.

It is an amenable number.

6557009 is a deficient number, since it is larger than the sum of its proper divisors (19795).

6557009 is a wasteful number, since it uses less digits than its factorization.

6557009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19794.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 6557009 is about 2560.6657337497. The cubic root of 6557009 is about 187.1695774612.

The spelling of 6557009 in words is "six million, five hundred fifty-seven thousand, nine".