22272281 has 2 divisors, whose sum is σ = 22272282. Its totient is φ = 22272280.

The previous prime is 22272277. The next prime is 22272287. The reversal of 22272281 is 18227222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16679056 + 5593225 = 4084^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 22272281 - 2² = 22272277 is a prime.

It is a super-2 number, since 2×22272281² = 992109001885922, 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 22272281.

It is not a weakly prime, because it can be changed into another prime (22272287) 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, 11136140 + 11136141.

It is an arithmetic number, because the mean of its divisors is an integer number (11136141).

Almost surely, 2^22272281 is an apocalyptic number.

It is an amenable number.

22272281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22272281 is an equidigital number, since it uses as much as digits as its factorization.

22272281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 26.

The square root of 22272281 is about 4719.3517563326. The cubic root of 22272281 is about 281.3551694915.

The spelling of 22272281 in words is "twenty-two million, two hundred seventy-two thousand, two hundred eighty-one".