199998597 has 4 divisors (see below), whose sum is σ = 266664800. Its totient is φ = 133332396.

The previous prime is 199998581. The next prime is 199998607. The reversal of 199998597 is 795899991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 199998597 - 2⁴ = 199998581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199998517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33333097 + ... + 33333102.

It is an arithmetic number, because the mean of its divisors is an integer number (66666200).

Almost surely, 2^199998597 is an apocalyptic number.

It is an amenable number.

199998597 is a deficient number, since it is larger than the sum of its proper divisors (66666203).

199998597 is an equidigital number, since it uses as much as digits as its factorization.

199998597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66666202.

The product of its digits is 16533720, while the sum is 66.

The square root of 199998597 is about 14142.0860201033. The cubic root of 199998597 is about 584.8021801737.

The spelling of 199998597 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred ninety-seven".