22019909 has 2 divisors, whose sum is σ = 22019910. Its totient is φ = 22019908.

The previous prime is 22019897. The next prime is 22019927. The reversal of 22019909 is 90991022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 8352100 = 3697^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 22019909 - 2²⁴ = 5242693 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 (22019969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11009954 + 11009955.

It is an arithmetic number, because the mean of its divisors is an integer number (11009955).

Almost surely, 2^22019909 is an apocalyptic number.

It is an amenable number.

22019909 is a deficient number, since it is larger than the sum of its proper divisors (1).

22019909 is an equidigital number, since it uses as much as digits as its factorization.

22019909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 22019909 is about 4692.5375864238. The cubic root of 22019909 is about 280.2884315225.

The spelling of 22019909 in words is "twenty-two million, nineteen thousand, nine hundred nine".