199865133 has 18 divisors (see below), whose sum is σ = 311139374. Its totient is φ = 122899824.

The previous prime is 199865111. The next prime is 199865137. The reversal of 199865133 is 331568991.

It can be written as a sum of positive squares in only one way, i.e., 138368169 + 61496964 = 11763^2 + 7842^2 .

It is not a de Polignac number, because 199865133 - 2⁸ = 199864877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199865137) 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 17 ways as a sum of consecutive naturals, for example, 152266 + ... + 153572.

Almost surely, 2^199865133 is an apocalyptic number.

199865133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

199865133 is a deficient number, since it is larger than the sum of its proper divisors (111274241).

199865133 is an equidigital number, since it uses as much as digits as its factorization.

199865133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633 (or 1323 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 199865133 is about 14137.3665510943. The cubic root of 199865133 is about 584.6720669174.

The spelling of 199865133 in words is "one hundred ninety-nine million, eight hundred sixty-five thousand, one hundred thirty-three".