198650019 has 4 divisors (see below), whose sum is σ = 264866696. Its totient is φ = 132433344.

The previous prime is 198649999. The next prime is 198650021. The reversal of 198650019 is 910056891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910056891 = 3 ⋅303352297.

It is not a de Polignac number, because 198650019 - 2¹¹ = 198647971 is a prime.

It is a super-2 number, since 2×198650019² = 78923660097400722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198652019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33108334 + ... + 33108339.

It is an arithmetic number, because the mean of its divisors is an integer number (66216674).

Almost surely, 2^198650019 is an apocalyptic number.

198650019 is a deficient number, since it is larger than the sum of its proper divisors (66216677).

198650019 is an equidigital number, since it uses as much as digits as its factorization.

198650019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66216676.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 198650019 is about 14094.3257731613. The cubic root of 198650019 is about 583.4847865427.

The spelling of 198650019 in words is "one hundred ninety-eight million, six hundred fifty thousand, nineteen".