1222220917 has 2 divisors, whose sum is σ = 1222220918. Its totient is φ = 1222220916.

The previous prime is 1222220893. The next prime is 1222220939. The reversal of 1222220917 is 7190222221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221222916 + 998001 = 34946^2 + 999^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222220917 - 2⁷ = 1222220789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222220617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611110458 + 611110459.

It is an arithmetic number, because the mean of its divisors is an integer number (611110459).

Almost surely, 2^1222220917 is an apocalyptic number.

It is an amenable number.

1222220917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222220917 is an equidigital number, since it uses as much as digits as its factorization.

1222220917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1222220917 is about 34960.2762717917. The cubic root of 1222220917 is about 1069.1777294035.

The spelling of 1222220917 in words is "one billion, two hundred twenty-two million, two hundred twenty thousand, nine hundred seventeen".