198968791 has 8 divisors (see below), whose sum is σ = 237279744. Its totient is φ = 163129560.

The previous prime is 198968773. The next prime is 198968801. The reversal of 198968791 is 197869891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198968791 - 2⁹ = 198968279 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 (198968701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617755 + ... + 618076.

It is an arithmetic number, because the mean of its divisors is an integer number (29659968).

Almost surely, 2^198968791 is an apocalyptic number.

198968791 is a deficient number, since it is larger than the sum of its proper divisors (38310953).

198968791 is a wasteful number, since it uses less digits than its factorization.

198968791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235861.

The product of its digits is 1959552, while the sum is 58.

The square root of 198968791 is about 14105.6297626161. The cubic root of 198968791 is about 583.7967241097.

The spelling of 198968791 in words is "one hundred ninety-eight million, nine hundred sixty-eight thousand, seven hundred ninety-one".