198055619 has 2 divisors, whose sum is σ = 198055620. Its totient is φ = 198055618.

The previous prime is 198055597. The next prime is 198055651. The reversal of 198055619 is 916550891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198055619 - 2¹² = 198051523 is a prime.

It is a super-2 number, since 2×198055619² = 78452056434946322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198055619.

It is not a weakly prime, because it can be changed into another prime (198055699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99027809 + 99027810.

It is an arithmetic number, because the mean of its divisors is an integer number (99027810).

Almost surely, 2^198055619 is an apocalyptic number.

198055619 is a deficient number, since it is larger than the sum of its proper divisors (1).

198055619 is an equidigital number, since it uses as much as digits as its factorization.

198055619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 44.

The square root of 198055619 is about 14073.2234758068. The cubic root of 198055619 is about 582.9022379708.

The spelling of 198055619 in words is "one hundred ninety-eight million, fifty-five thousand, six hundred nineteen".