1222778281 has 2 divisors, whose sum is σ = 1222778282. Its totient is φ = 1222778280.

The previous prime is 1222778239. The next prime is 1222778299. The reversal of 1222778281 is 1828772221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 867832681 + 354945600 = 29459^2 + 18840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222778281 - 2⁷ = 1222778153 is a prime.

It is a super-2 number, since 2×1222778281² = 2990373448970629922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1222776281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611389140 + 611389141.

It is an arithmetic number, because the mean of its divisors is an integer number (611389141).

Almost surely, 2^1222778281 is an apocalyptic number.

It is an amenable number.

1222778281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222778281 is an equidigital number, since it uses as much as digits as its factorization.

1222778281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50176, while the sum is 40.

The square root of 1222778281 is about 34968.2467533046. The cubic root of 1222778281 is about 1069.3402288353.

The spelling of 1222778281 in words is "one billion, two hundred twenty-two million, seven hundred seventy-eight thousand, two hundred eighty-one".