199681133 has 8 divisors (see below), whose sum is σ = 213368760. Its totient is φ = 186209280.

The previous prime is 199681117. The next prime is 199681159. The reversal of 199681133 is 331186991.

It can be written as a sum of positive squares in 4 ways, for example, as 60016009 + 139665124 = 7747^2 + 11818^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 199681133 - 2⁴ = 199681117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199611133) 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 7 ways as a sum of consecutive naturals, for example, 52028 + ... + 55733.

It is an arithmetic number, because the mean of its divisors is an integer number (26671095).

Almost surely, 2^199681133 is an apocalyptic number.

It is an amenable number.

199681133 is a deficient number, since it is larger than the sum of its proper divisors (13687627).

199681133 is a wasteful number, since it uses less digits than its factorization.

199681133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107887.

The product of its digits is 34992, while the sum is 41.

The square root of 199681133 is about 14130.8574757514. The cubic root of 199681133 is about 584.4925914065.

The spelling of 199681133 in words is "one hundred ninety-nine million, six hundred eighty-one thousand, one hundred thirty-three".