22049681 has 2 divisors, whose sum is σ = 22049682. Its totient is φ = 22049680.

The previous prime is 22049641. The next prime is 22049683. The reversal of 22049681 is 18694022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17297281 + 4752400 = 4159^2 + 2180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22049681 is a prime.

It is a super-2 number, since 2×22049681² = 972376864403522, which contains 22 as substring.

Together with 22049683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22049683) 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, 11024840 + 11024841.

It is an arithmetic number, because the mean of its divisors is an integer number (11024841).

Almost surely, 2^22049681 is an apocalyptic number.

It is an amenable number.

22049681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22049681 is an equidigital number, since it uses as much as digits as its factorization.

22049681 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 22049681 is about 4695.7087856893. The cubic root of 22049681 is about 280.4146958828.

The spelling of 22049681 in words is "twenty-two million, forty-nine thousand, six hundred eighty-one".