22778281 has 2 divisors, whose sum is σ = 22778282. Its totient is φ = 22778280.

The previous prime is 22778269. The next prime is 22778293. The reversal of 22778281 is 18287722.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (22778269) and next prime (22778293).

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 6456681 = 4040^2 + 2541^2 .

It is a cyclic number.

It is not a de Polignac number, because 22778281 - 2⁷ = 22778153 is a prime.

It is a super-2 number, since 2×22778281² = 1037700170629922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22778281.

It is not a weakly prime, because it can be changed into another prime (22778081) 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, 11389140 + 11389141.

It is an arithmetic number, because the mean of its divisors is an integer number (11389141).

Almost surely, 2^22778281 is an apocalyptic number.

It is an amenable number.

22778281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22778281 is an equidigital number, since it uses as much as digits as its factorization.

22778281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 37.

The square root of 22778281 is about 4772.6597406478. The cubic root of 22778281 is about 283.4699206112.

The spelling of 22778281 in words is "twenty-two million, seven hundred seventy-eight thousand, two hundred eighty-one".