866000909 has 2 divisors, whose sum is σ = 866000910. Its totient is φ = 866000908.

The previous prime is 866000887. The next prime is 866001011. The reversal of 866000909 is 909000668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 853925284 + 12075625 = 29222^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 866000909 - 2¹⁶ = 865935373 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 (866000309) 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, 433000454 + 433000455.

It is an arithmetic number, because the mean of its divisors is an integer number (433000455).

Almost surely, 2^866000909 is an apocalyptic number.

It is an amenable number.

866000909 is a deficient number, since it is larger than the sum of its proper divisors (1).

866000909 is an equidigital number, since it uses as much as digits as its factorization.

866000909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 866000909 is about 29427.8933836590. The cubic root of 866000909 is about 953.1753062460.

The spelling of 866000909 in words is "eight hundred sixty-six million, nine hundred nine", and thus it is an aban number.