198281819 has 2 divisors, whose sum is σ = 198281820. Its totient is φ = 198281818.

The previous prime is 198281801. The next prime is 198281821. The reversal of 198281819 is 918182891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198281819 is a prime.

It is a super-2 number, since 2×198281819² = 78631359491897522, which contains 22 as substring.

Together with 198281821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198281849) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99140909 + 99140910.

It is an arithmetic number, because the mean of its divisors is an integer number (99140910).

Almost surely, 2^198281819 is an apocalyptic number.

198281819 is a deficient number, since it is larger than the sum of its proper divisors (1).

198281819 is an equidigital number, since it uses as much as digits as its factorization.

198281819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 47.

The square root of 198281819 is about 14081.2577208146. The cubic root of 198281819 is about 583.1240650891.

The spelling of 198281819 in words is "one hundred ninety-eight million, two hundred eighty-one thousand, eight hundred nineteen".