22081649 has 2 divisors, whose sum is σ = 22081650. Its totient is φ = 22081648.

The previous prime is 22081603. The next prime is 22081663. The reversal of 22081649 is 94618022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21529600 + 552049 = 4640^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 22081649 - 2²⁰ = 21033073 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22081049) 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, 11040824 + 11040825.

It is an arithmetic number, because the mean of its divisors is an integer number (11040825).

Almost surely, 2^22081649 is an apocalyptic number.

It is an amenable number.

22081649 is a deficient number, since it is larger than the sum of its proper divisors (1).

22081649 is an equidigital number, since it uses as much as digits as its factorization.

22081649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 22081649 is about 4699.1115117648. Note that the first 3 decimals coincide. The cubic root of 22081649 is about 280.5501470984.

The spelling of 22081649 in words is "twenty-two million, eighty-one thousand, six hundred forty-nine".