22125809 has 2 divisors, whose sum is σ = 22125810. Its totient is φ = 22125808.

The previous prime is 22125799. The next prime is 22125821. The reversal of 22125809 is 90852122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18515809 + 3610000 = 4303^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 22125809 - 2¹² = 22121713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22128809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11062904 + 11062905.

It is an arithmetic number, because the mean of its divisors is an integer number (11062905).

Almost surely, 2^22125809 is an apocalyptic number.

It is an amenable number.

22125809 is a deficient number, since it is larger than the sum of its proper divisors (1).

22125809 is an equidigital number, since it uses as much as digits as its factorization.

22125809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 22125809 is about 4703.8079255004. The cubic root of 22125809 is about 280.7370420307.

The spelling of 22125809 in words is "twenty-two million, one hundred twenty-five thousand, eight hundred nine".