22222649 has 2 divisors, whose sum is σ = 22222650. Its totient is φ = 22222648.

The previous prime is 22222643. The next prime is 22222661. The reversal of 22222649 is 94622222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11854249 + 10368400 = 3443^2 + 3220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22222649 is a prime.

It is a super-2 number, since 2×22222649² = 987692257154402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22222643) 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, 11111324 + 11111325.

It is an arithmetic number, because the mean of its divisors is an integer number (11111325).

Almost surely, 2^22222649 is an apocalyptic number.

It is an amenable number.

22222649 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222649 is an equidigital number, since it uses as much as digits as its factorization.

22222649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 22222649 is about 4714.0904743121. The cubic root of 22222649 is about 281.1460215473.

The spelling of 22222649 in words is "twenty-two million, two hundred twenty-two thousand, six hundred forty-nine".