198812717 has 2 divisors, whose sum is σ = 198812718. Its totient is φ = 198812716.

The previous prime is 198812701. The next prime is 198812723. The reversal of 198812717 is 717218891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112805641 + 86007076 = 10621^2 + 9274^2 .

It is an emirp because it is prime and its reverse (717218891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198812717 - 2⁴ = 198812701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198812737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99406358 + 99406359.

It is an arithmetic number, because the mean of its divisors is an integer number (99406359).

Almost surely, 2^198812717 is an apocalyptic number.

It is an amenable number.

198812717 is a deficient number, since it is larger than the sum of its proper divisors (1).

198812717 is an equidigital number, since it uses as much as digits as its factorization.

198812717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 44.

The square root of 198812717 is about 14100.0963471886. The cubic root of 198812717 is about 583.6440379791.

The spelling of 198812717 in words is "one hundred ninety-eight million, eight hundred twelve thousand, seven hundred seventeen".