22540649 has 2 divisors, whose sum is σ = 22540650. Its totient is φ = 22540648.

The previous prime is 22540619. The next prime is 22540711. The reversal of 22540649 is 94604522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 5607424 = 4115^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 22540649 - 2¹⁶ = 22475113 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 (22540619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11270324 + 11270325.

It is an arithmetic number, because the mean of its divisors is an integer number (11270325).

Almost surely, 2^22540649 is an apocalyptic number.

It is an amenable number.

22540649 is a deficient number, since it is larger than the sum of its proper divisors (1).

22540649 is an equidigital number, since it uses as much as digits as its factorization.

22540649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 22540649 is about 4747.6993375739. The cubic root of 22540649 is about 282.4807160460.

The spelling of 22540649 in words is "twenty-two million, five hundred forty thousand, six hundred forty-nine".