6564749 has 2 divisors, whose sum is σ = 6564750. Its totient is φ = 6564748.

The previous prime is 6564707. The next prime is 6564763. The reversal of 6564749 is 9474656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5207524 + 1357225 = 2282^2 + 1165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6564749 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₄₄₈₈₉₈ and since 6564749 and 448898 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6564769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282374 + 3282375.

It is an arithmetic number, because the mean of its divisors is an integer number (3282375).

Almost surely, 2^6564749 is an apocalyptic number.

It is an amenable number.

6564749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564749 is an equidigital number, since it uses as much as digits as its factorization.

6564749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 41.

The square root of 6564749 is about 2562.1766137407. The cubic root of 6564749 is about 187.2431945063.

The spelling of 6564749 in words is "six million, five hundred sixty-four thousand, seven hundred forty-nine".