11021809 has 2 divisors, whose sum is σ = 11021810. Its totient is φ = 11021808.

The previous prime is 11021789. The next prime is 11021839. The reversal of 11021809 is 90812011.

11021809 is digitally balanced in base 2, 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., 10336225 + 685584 = 3215^2 + 828^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021809 - 2¹⁹ = 10497521 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11021809.

It is not a weakly prime, because it can be changed into another prime (11021839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510904 + 5510905.

It is an arithmetic number, because the mean of its divisors is an integer number (5510905).

Almost surely, 2^11021809 is an apocalyptic number.

It is an amenable number.

11021809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021809 is an equidigital number, since it uses as much as digits as its factorization.

11021809 is an evil number, because the sum of its binary digits is even.

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

The square root of 11021809 is about 3319.9109927828. The cubic root of 11021809 is about 222.5448901557.

The spelling of 11021809 in words is "eleven million, twenty-one thousand, eight hundred nine".