198120019 has 2 divisors, whose sum is σ = 198120020. Its totient is φ = 198120018.

The previous prime is 198120007. The next prime is 198120031. The reversal of 198120019 is 910021891.

It is a balanced prime because it is at equal distance from previous prime (198120007) and next prime (198120031).

It is a cyclic number.

It is not a de Polignac number, because 198120019 - 2¹¹ = 198117971 is a prime.

It is a super-2 number, since 2×198120019² = 78503083857120722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198120059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99060009 + 99060010.

It is an arithmetic number, because the mean of its divisors is an integer number (99060010).

Almost surely, 2^198120019 is an apocalyptic number.

198120019 is a deficient number, since it is larger than the sum of its proper divisors (1).

198120019 is an equidigital number, since it uses as much as digits as its factorization.

198120019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 198120019 is about 14075.5113228614. The cubic root of 198120019 is about 582.9654101853.

The spelling of 198120019 in words is "one hundred ninety-eight million, one hundred twenty thousand, nineteen".