10209209 has 2 divisors, whose sum is σ = 10209210. Its totient is φ = 10209208.

The previous prime is 10209203. The next prime is 10209229. The reversal of 10209209 is 90290201.

10209209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5382400 + 4826809 = 2320^2 + 2197^2 .

It is a cyclic number.

It is not a de Polignac number, because 10209209 - 2⁸ = 10208953 is a prime.

It is not a weakly prime, because it can be changed into another prime (10209203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5104604 + 5104605.

It is an arithmetic number, because the mean of its divisors is an integer number (5104605).

Almost surely, 2^10209209 is an apocalyptic number.

It is an amenable number.

10209209 is a deficient number, since it is larger than the sum of its proper divisors (1).

10209209 is an equidigital number, since it uses as much as digits as its factorization.

10209209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 10209209 is about 3195.1852841424. The cubic root of 10209209 is about 216.9355355102.

The spelling of 10209209 in words is "ten million, two hundred nine thousand, two hundred nine".