199998559 has 2 divisors, whose sum is σ = 199998560. Its totient is φ = 199998558.

The previous prime is 199998517. The next prime is 199998563. The reversal of 199998559 is 955899991.

It is a strong prime.

It is an emirp because it is prime and its reverse (955899991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199998559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199998559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199995559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999279 + 99999280.

It is an arithmetic number, because the mean of its divisors is an integer number (99999280).

Almost surely, 2^199998559 is an apocalyptic number.

199998559 is a deficient number, since it is larger than the sum of its proper divisors (1).

199998559 is an equidigital number, since it uses as much as digits as its factorization.

199998559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11809800, while the sum is 64.

The square root of 199998559 is about 14142.0846765956. The cubic root of 199998559 is about 584.8021431360.

The spelling of 199998559 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred fifty-nine".