222278249 has 2 divisors, whose sum is σ = 222278250. Its totient is φ = 222278248.

The previous prime is 222278219. The next prime is 222278257. The reversal of 222278249 is 942872222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218448400 + 3829849 = 14780^2 + 1957^2 .

It is a cyclic number.

It is not a de Polignac number, because 222278249 - 2¹² = 222274153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222278219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111139124 + 111139125.

It is an arithmetic number, because the mean of its divisors is an integer number (111139125).

Almost surely, 2^222278249 is an apocalyptic number.

It is an amenable number.

222278249 is a deficient number, since it is larger than the sum of its proper divisors (1).

222278249 is an equidigital number, since it uses as much as digits as its factorization.

222278249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 222278249 is about 14908.9989268227. The cubic root of 222278249 is about 605.7577637058.

The spelling of 222278249 in words is "two hundred twenty-two million, two hundred seventy-eight thousand, two hundred forty-nine".