11021909 has 2 divisors, whose sum is σ = 11021910. Its totient is φ = 11021908.

The previous prime is 11021903. The next prime is 11021917. The reversal of 11021909 is 90912011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8282884 + 2739025 = 2878^2 + 1655^2 .

It is an emirp because it is prime and its reverse (90912011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11021909 - 2¹⁶ = 10956373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021903) 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, 5510954 + 5510955.

It is an arithmetic number, because the mean of its divisors is an integer number (5510955).

Almost surely, 2^11021909 is an apocalyptic number.

It is an amenable number.

11021909 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021909 is an equidigital number, since it uses as much as digits as its factorization.

11021909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 11021909 is about 3319.9260533934. The cubic root of 11021909 is about 222.5455631977.

The spelling of 11021909 in words is "eleven million, twenty-one thousand, nine hundred nine".