198216959 has 4 divisors (see below), whose sum is σ = 199006920. Its totient is φ = 197427000.

The previous prime is 198216947. The next prime is 198217009. The reversal of 198216959 is 959612891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198216959 - 2⁸ = 198216703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198216929) 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 3 ways as a sum of consecutive naturals, for example, 394604 + ... + 395105.

It is an arithmetic number, because the mean of its divisors is an integer number (49751730).

Almost surely, 2^198216959 is an apocalyptic number.

198216959 is a deficient number, since it is larger than the sum of its proper divisors (789961).

198216959 is an equidigital number, since it uses as much as digits as its factorization.

198216959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789960.

The product of its digits is 349920, while the sum is 50.

The square root of 198216959 is about 14078.9544711246. The cubic root of 198216959 is about 583.0604762173.

The spelling of 198216959 in words is "one hundred ninety-eight million, two hundred sixteen thousand, nine hundred fifty-nine".