6544009 has 2 divisors, whose sum is σ = 6544010. Its totient is φ = 6544008.

The previous prime is 6544003. The next prime is 6544039. The reversal of 6544009 is 9004456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3404025 + 3139984 = 1845^2 + 1772^2 .

It is a cyclic number.

It is not a de Polignac number, because 6544009 - 2⁹ = 6543497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6544003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272004 + 3272005.

It is an arithmetic number, because the mean of its divisors is an integer number (3272005).

Almost surely, 2^6544009 is an apocalyptic number.

It is an amenable number.

6544009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6544009 is an equidigital number, since it uses as much as digits as its factorization.

6544009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6544009 is about 2558.1260719519. The cubic root of 6544009 is about 187.0458007863.

The spelling of 6544009 in words is "six million, five hundred forty-four thousand, nine".