198210191 has 4 divisors (see below), whose sum is σ = 209869632. Its totient is φ = 186550752.

The previous prime is 198210163. The next prime is 198210197. The reversal of 198210191 is 191012891.

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 198210191 - 2⁶ = 198210127 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 (198210197) 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, 5829695 + ... + 5829728.

It is an arithmetic number, because the mean of its divisors is an integer number (52467408).

Almost surely, 2^198210191 is an apocalyptic number.

198210191 is a deficient number, since it is larger than the sum of its proper divisors (11659441).

198210191 is a wasteful number, since it uses less digits than its factorization.

198210191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11659440.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 198210191 is about 14078.7141103156. The cubic root of 198210191 is about 583.0538400575.

The spelling of 198210191 in words is "one hundred ninety-eight million, two hundred ten thousand, one hundred ninety-one".