22128149 has 2 divisors, whose sum is σ = 22128150. Its totient is φ = 22128148.

The previous prime is 22128143. The next prime is 22128167. The reversal of 22128149 is 94182122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21921124 + 207025 = 4682^2 + 455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22128149 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 (22128143) 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, 11064074 + 11064075.

It is an arithmetic number, because the mean of its divisors is an integer number (11064075).

Almost surely, 2^22128149 is an apocalyptic number.

It is an amenable number.

22128149 is a deficient number, since it is larger than the sum of its proper divisors (1).

22128149 is an equidigital number, since it uses as much as digits as its factorization.

22128149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 22128149 is about 4704.0566535704. The cubic root of 22128149 is about 280.7469384902.

The spelling of 22128149 in words is "twenty-two million, one hundred twenty-eight thousand, one hundred forty-nine".