10866209 has 2 divisors, whose sum is σ = 10866210. Its totient is φ = 10866208.

The previous prime is 10866203. The next prime is 10866211. The reversal of 10866209 is 90266801.

10866209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10336225 + 529984 = 3215^2 + 728^2 .

It is a cyclic number.

It is not a de Polignac number, because 10866209 - 2¹² = 10862113 is a prime.

Together with 10866211, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₇₁₈₂₆₈ and since 10866209 and 718268 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (10866203) 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, 5433104 + 5433105.

It is an arithmetic number, because the mean of its divisors is an integer number (5433105).

Almost surely, 2^10866209 is an apocalyptic number.

It is an amenable number.

10866209 is a deficient number, since it is larger than the sum of its proper divisors (1).

10866209 is an equidigital number, since it uses as much as digits as its factorization.

10866209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 10866209 is about 3296.3933321131. The cubic root of 10866209 is about 221.4926663865.

The spelling of 10866209 in words is "ten million, eight hundred sixty-six thousand, two hundred nine".