198984491 has 4 divisors (see below), whose sum is σ = 199120152. Its totient is φ = 198848832.

The previous prime is 198984481. The next prime is 198984503. The reversal of 198984491 is 194489891.

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 198984491 - 2¹⁰ = 198983467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198984451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65606 + ... + 68571.

It is an arithmetic number, because the mean of its divisors is an integer number (49780038).

Almost surely, 2^198984491 is an apocalyptic number.

198984491 is a deficient number, since it is larger than the sum of its proper divisors (135661).

198984491 is a wasteful number, since it uses less digits than its factorization.

198984491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135660.

The product of its digits is 746496, while the sum is 53.

The square root of 198984491 is about 14106.1862670248. The cubic root of 198984491 is about 583.8120788921.

It can be divided in two parts, 19898 and 4491, that added together give a cube (24389 = 29³).

The spelling of 198984491 in words is "one hundred ninety-eight million, nine hundred eighty-four thousand, four hundred ninety-one".