6684749 has 2 divisors, whose sum is σ = 6684750. Its totient is φ = 6684748.

The previous prime is 6684719. The next prime is 6684773. The reversal of 6684749 is 9474866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4182025 + 2502724 = 2045^2 + 1582^2 .

It is a cyclic number.

It is not a de Polignac number, because 6684749 - 2⁸ = 6684493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6684719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342374 + 3342375.

It is an arithmetic number, because the mean of its divisors is an integer number (3342375).

Almost surely, 2^6684749 is an apocalyptic number.

It is an amenable number.

6684749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6684749 is an equidigital number, since it uses as much as digits as its factorization.

6684749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 44.

The square root of 6684749 is about 2585.4881550686. The cubic root of 6684749 is about 188.3772134335.

The spelling of 6684749 in words is "six million, six hundred eighty-four thousand, seven hundred forty-nine".