22782281 has 2 divisors, whose sum is σ = 22782282. Its totient is φ = 22782280.

The previous prime is 22782271. The next prime is 22782323. The reversal of 22782281 is 18228722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15405625 + 7376656 = 3925^2 + 2716^2 .

It is a cyclic number.

It is not a de Polignac number, because 22782281 - 2¹⁸ = 22520137 is a prime.

It is a super-2 number, since 2×22782281² = 1038064655125922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22782251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11391140 + 11391141.

It is an arithmetic number, because the mean of its divisors is an integer number (11391141).

Almost surely, 2^22782281 is an apocalyptic number.

It is an amenable number.

22782281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22782281 is an equidigital number, since it uses as much as digits as its factorization.

22782281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 32.

The square root of 22782281 is about 4773.0787758008. The cubic root of 22782281 is about 283.4865126346.

The spelling of 22782281 in words is "twenty-two million, seven hundred eighty-two thousand, two hundred eighty-one".