198919213 has 2 divisors, whose sum is σ = 198919214. Its totient is φ = 198919212.

The previous prime is 198919187. The next prime is 198919243. The reversal of 198919213 is 312919891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146240649 + 52678564 = 12093^2 + 7258^2 .

It is an emirp because it is prime and its reverse (312919891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198919213 - 2⁹ = 198918701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198919213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198919243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99459606 + 99459607.

It is an arithmetic number, because the mean of its divisors is an integer number (99459607).

Almost surely, 2^198919213 is an apocalyptic number.

It is an amenable number.

198919213 is a deficient number, since it is larger than the sum of its proper divisors (1).

198919213 is an equidigital number, since it uses as much as digits as its factorization.

198919213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 43.

The square root of 198919213 is about 14103.8722696996. The cubic root of 198919213 is about 583.7482309462.

The spelling of 198919213 in words is "one hundred ninety-eight million, nine hundred nineteen thousand, two hundred thirteen".