22278749 has 2 divisors, whose sum is σ = 22278750. Its totient is φ = 22278748.

The previous prime is 22278731. The next prime is 22278793. The reversal of 22278749 is 94787222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22231225 + 47524 = 4715^2 + 218^2 .

It is a cyclic number.

It is not a de Polignac number, because 22278749 - 2⁸ = 22278493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22278719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11139374 + 11139375.

It is an arithmetic number, because the mean of its divisors is an integer number (11139375).

Almost surely, 2^22278749 is an apocalyptic number.

It is an amenable number.

22278749 is a deficient number, since it is larger than the sum of its proper divisors (1).

22278749 is an equidigital number, since it uses as much as digits as its factorization.

22278749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 41.

The square root of 22278749 is about 4720.0369701942. The cubic root of 22278749 is about 281.3824025816.

The spelling of 22278749 in words is "twenty-two million, two hundred seventy-eight thousand, seven hundred forty-nine".