199117873 has 4 divisors (see below), whose sum is σ = 202874868. Its totient is φ = 195360880.

The previous prime is 199117859. The next prime is 199117879. The reversal of 199117873 is 378711991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172975104 + 26142769 = 13152^2 + 5113^2 .

It is a cyclic number.

It is not a de Polignac number, because 199117873 - 2¹³ = 199109681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199117879) 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, 1878418 + ... + 1878523.

It is an arithmetic number, because the mean of its divisors is an integer number (50718717).

Almost surely, 2^199117873 is an apocalyptic number.

It is an amenable number.

199117873 is a deficient number, since it is larger than the sum of its proper divisors (3756995).

199117873 is an equidigital number, since it uses as much as digits as its factorization.

199117873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3756994.

The product of its digits is 95256, while the sum is 46.

The square root of 199117873 is about 14110.9132588929. The cubic root of 199117873 is about 583.9424954716.

The spelling of 199117873 in words is "one hundred ninety-nine million, one hundred seventeen thousand, eight hundred seventy-three".