22071809 has 2 divisors, whose sum is σ = 22071810. Its totient is φ = 22071808.

The previous prime is 22071793. The next prime is 22071839. The reversal of 22071809 is 90817022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22061809 + 10000 = 4697^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 22071809 - 2⁴ = 22071793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22071839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11035904 + 11035905.

It is an arithmetic number, because the mean of its divisors is an integer number (11035905).

Almost surely, 2^22071809 is an apocalyptic number.

It is an amenable number.

22071809 is a deficient number, since it is larger than the sum of its proper divisors (1).

22071809 is an equidigital number, since it uses as much as digits as its factorization.

22071809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 22071809 is about 4698.0643886605. The cubic root of 22071809 is about 280.5084680914.

The spelling of 22071809 in words is "twenty-two million, seventy-one thousand, eight hundred nine".