198968959 has 6 divisors (see below), whose sum is σ = 231453744. Its totient is φ = 170544780.

The previous prime is 198968951. The next prime is 198968963. The reversal of 198968959 is 959869891.

It is not a de Polignac number, because 198968959 - 2³ = 198968951 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198968959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198968951) 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 in 5 ways as a sum of consecutive naturals, for example, 2030247 + ... + 2030344.

It is an arithmetic number, because the mean of its divisors is an integer number (38575624).

Almost surely, 2^198968959 is an apocalyptic number.

198968959 is a deficient number, since it is larger than the sum of its proper divisors (32484785).

198968959 is an equidigital number, since it uses as much as digits as its factorization.

198968959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060605 (or 4060598 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 64.

The square root of 198968959 is about 14105.6357176839. The cubic root of 198968959 is about 583.7968884199.

The spelling of 198968959 in words is "one hundred ninety-eight million, nine hundred sixty-eight thousand, nine hundred fifty-nine".