22788281 has 2 divisors, whose sum is σ = 22788282. Its totient is φ = 22788280.

The previous prime is 22788247. The next prime is 22788329. The reversal of 22788281 is 18288722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21949225 + 839056 = 4685^2 + 916^2 .

It is a cyclic number.

It is not a de Polignac number, because 22788281 - 2⁶ = 22788217 is a prime.

It is a super-2 number, since 2×22788281² = 1038611501869922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22788221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11394140 + 11394141.

It is an arithmetic number, because the mean of its divisors is an integer number (11394141).

Almost surely, 2^22788281 is an apocalyptic number.

It is an amenable number.

22788281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22788281 is an equidigital number, since it uses as much as digits as its factorization.

22788281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 38.

The square root of 22788281 is about 4773.7072595625. The cubic root of 22788281 is about 283.5113970287.

The spelling of 22788281 in words is "twenty-two million, seven hundred eighty-eight thousand, two hundred eighty-one".