198061819 has 2 divisors, whose sum is σ = 198061820. Its totient is φ = 198061818.

The previous prime is 198061817. The next prime is 198061823. The reversal of 198061819 is 918160891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198061819 - 2¹ = 198061817 is a prime.

It is a super-2 number, since 2×198061819² = 78456968291177522, which contains 22 as substring.

Together with 198061817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (198061817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99030909 + 99030910.

It is an arithmetic number, because the mean of its divisors is an integer number (99030910).

Almost surely, 2^198061819 is an apocalyptic number.

198061819 is a deficient number, since it is larger than the sum of its proper divisors (1).

198061819 is an equidigital number, since it uses as much as digits as its factorization.

198061819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 43.

The square root of 198061819 is about 14073.4437505537. The cubic root of 198061819 is about 582.9083203636.

The spelling of 198061819 in words is "one hundred ninety-eight million, sixty-one thousand, eight hundred nineteen".