6650909 has 2 divisors, whose sum is σ = 6650910. Its totient is φ = 6650908.

The previous prime is 6650869. The next prime is 6650911. The reversal of 6650909 is 9090566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4020025 + 2630884 = 2005^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650909 - 2¹⁶ = 6585373 is a prime.

It is a Sophie Germain prime.

Together with 6650911, it forms a pair of twin primes.

It is a Chen prime.

6650909 is a modest number, since divided by 909 gives 665 as remainder.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6650929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325454 + 3325455.

It is an arithmetic number, because the mean of its divisors is an integer number (3325455).

Almost surely, 2^6650909 is an apocalyptic number.

It is an amenable number.

6650909 is a deficient number, since it is larger than the sum of its proper divisors (1).

6650909 is an equidigital number, since it uses as much as digits as its factorization.

6650909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 6650909 is about 2578.9356331634. The cubic root of 6650909 is about 188.0588034704.

The spelling of 6650909 in words is "six million, six hundred fifty thousand, nine hundred nine".