1198566217 has 2 divisors, whose sum is σ = 1198566218. Its totient is φ = 1198566216.

The previous prime is 1198566203. The next prime is 1198566277. The reversal of 1198566217 is 7126658911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 721405881 + 477160336 = 26859^2 + 21844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1198566217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1198566277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599283108 + 599283109.

It is an arithmetic number, because the mean of its divisors is an integer number (599283109).

Almost surely, 2^1198566217 is an apocalyptic number.

It is an amenable number.

1198566217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198566217 is an equidigital number, since it uses as much as digits as its factorization.

1198566217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 46.

The square root of 1198566217 is about 34620.3150909982. The cubic root of 1198566217 is about 1062.2351722349.

The spelling of 1198566217 in words is "one billion, one hundred ninety-eight million, five hundred sixty-six thousand, two hundred seventeen".