6649109 has 4 divisors (see below), whose sum is σ = 6710220. Its totient is φ = 6588000.

The previous prime is 6649103. The next prime is 6649117. The reversal of 6649109 is 9019466.

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 4502884 + 2146225 = 2122^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 6649109 - 2¹² = 6645013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649103) 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, 30392 + ... + 30609.

It is an arithmetic number, because the mean of its divisors is an integer number (1677555).

Almost surely, 2^6649109 is an apocalyptic number.

It is an amenable number.

6649109 is a deficient number, since it is larger than the sum of its proper divisors (61111).

6649109 is a wasteful number, since it uses less digits than its factorization.

6649109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61110.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 6649109 is about 2578.5866283683. The cubic root of 6649109 is about 188.0418365471.

The spelling of 6649109 in words is "six million, six hundred forty-nine thousand, one hundred nine".