11810209 has 2 divisors, whose sum is σ = 11810210. Its totient is φ = 11810208.

The previous prime is 11810203. The next prime is 11810213. The reversal of 11810209 is 90201811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10112400 + 1697809 = 3180^2 + 1303^2 .

It is a cyclic number.

It is not a de Polignac number, because 11810209 - 2⁵ = 11810177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11810209.

It is not a weakly prime, because it can be changed into another prime (11810203) 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, 5905104 + 5905105.

It is an arithmetic number, because the mean of its divisors is an integer number (5905105).

Almost surely, 2^11810209 is an apocalyptic number.

It is an amenable number.

11810209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11810209 is an equidigital number, since it uses as much as digits as its factorization.

11810209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 11810209 is about 3436.5984635974. The cubic root of 11810209 is about 227.7294484989.

The spelling of 11810209 in words is "eleven million, eight hundred ten thousand, two hundred nine".