6221909 has 2 divisors, whose sum is σ = 6221910. Its totient is φ = 6221908.

The previous prime is 6221879. The next prime is 6221927. The reversal of 6221909 is 9091226.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3591025 + 2630884 = 1895^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 6221909 - 2¹⁶ = 6156373 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6221989) 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, 3110954 + 3110955.

It is an arithmetic number, because the mean of its divisors is an integer number (3110955).

Almost surely, 2^6221909 is an apocalyptic number.

It is an amenable number.

6221909 is a deficient number, since it is larger than the sum of its proper divisors (1).

6221909 is an equidigital number, since it uses as much as digits as its factorization.

6221909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 6221909 is about 2494.3754729391. The cubic root of 6221909 is about 183.9251921009.

The spelling of 6221909 in words is "six million, two hundred twenty-one thousand, nine hundred nine".