198773819 has 2 divisors, whose sum is σ = 198773820. Its totient is φ = 198773818.

The previous prime is 198773777. The next prime is 198773851. The reversal of 198773819 is 918377891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198773819 - 2²⁴ = 181996603 is a prime.

It is a super-3 number, since 3×198773819³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198713819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99386909 + 99386910.

It is an arithmetic number, because the mean of its divisors is an integer number (99386910).

Almost surely, 2^198773819 is an apocalyptic number.

198773819 is a deficient number, since it is larger than the sum of its proper divisors (1).

198773819 is an equidigital number, since it uses as much as digits as its factorization.

198773819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 53.

The square root of 198773819 is about 14098.7169274370. The cubic root of 198773819 is about 583.6059718921.

The spelling of 198773819 in words is "one hundred ninety-eight million, seven hundred seventy-three thousand, eight hundred nineteen".