198643199 has 4 divisors (see below), whose sum is σ = 198751464. Its totient is φ = 198534936.

The previous prime is 198643189. The next prime is 198643201. The reversal of 198643199 is 991346891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198643199 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 (198643129) 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, 51332 + ... + 55065.

It is an arithmetic number, because the mean of its divisors is an integer number (49687866).

Almost surely, 2^198643199 is an apocalyptic number.

198643199 is a deficient number, since it is larger than the sum of its proper divisors (108265).

198643199 is a wasteful number, since it uses less digits than its factorization.

198643199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108264.

The product of its digits is 419904, while the sum is 50.

The square root of 198643199 is about 14094.0838297493. The cubic root of 198643199 is about 583.4781091177.

The spelling of 198643199 in words is "one hundred ninety-eight million, six hundred forty-three thousand, one hundred ninety-nine".