198566317 has 2 divisors, whose sum is σ = 198566318. Its totient is φ = 198566316.

The previous prime is 198566287. The next prime is 198566323. The reversal of 198566317 is 713665891.

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., 163353961 + 35212356 = 12781^2 + 5934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198566317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198566327) 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, 99283158 + 99283159.

It is an arithmetic number, because the mean of its divisors is an integer number (99283159).

Almost surely, 2^198566317 is an apocalyptic number.

It is an amenable number.

198566317 is a deficient number, since it is larger than the sum of its proper divisors (1).

198566317 is an equidigital number, since it uses as much as digits as its factorization.

198566317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 198566317 is about 14091.3561093317. The cubic root of 198566317 is about 583.4028237941.

The spelling of 198566317 in words is "one hundred ninety-eight million, five hundred sixty-six thousand, three hundred seventeen".