6609989 has 2 divisors, whose sum is σ = 6609990. Its totient is φ = 6609988.

The previous prime is 6609973. The next prime is 6610049. The reversal of 6609989 is 9899066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6461764 + 148225 = 2542^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 6609989 - 2⁴ = 6609973 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6609089) 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, 3304994 + 3304995.

It is an arithmetic number, because the mean of its divisors is an integer number (3304995).

Almost surely, 2^6609989 is an apocalyptic number.

It is an amenable number.

6609989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6609989 is an equidigital number, since it uses as much as digits as its factorization.

6609989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 6609989 is about 2570.9898871835. The cubic root of 6609989 is about 187.6723298607.

The spelling of 6609989 in words is "six million, six hundred nine thousand, nine hundred eighty-nine".