198641911 has 4 divisors (see below), whose sum is σ = 213922072. Its totient is φ = 183361752.

The previous prime is 198641879. The next prime is 198641921. The reversal of 198641911 is 119146891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119146891 = 19 ⋅6270889.

It is a cyclic number.

It is not a de Polignac number, because 198641911 - 2⁵ = 198641879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198641921) 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, 7640061 + ... + 7640086.

It is an arithmetic number, because the mean of its divisors is an integer number (53480518).

Almost surely, 2^198641911 is an apocalyptic number.

198641911 is a deficient number, since it is larger than the sum of its proper divisors (15280161).

198641911 is a wasteful number, since it uses less digits than its factorization.

198641911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15280160.

The product of its digits is 15552, while the sum is 40.

The square root of 198641911 is about 14094.0381367442. The cubic root of 198641911 is about 583.4768480267.

The spelling of 198641911 in words is "one hundred ninety-eight million, six hundred forty-one thousand, nine hundred eleven".