199999971 has 12 divisors (see below), whose sum is σ = 292958640. Its totient is φ = 131454960.

The previous prime is 199999963. The next prime is 199999991. The reversal of 199999971 is 179999991.

It is not a de Polignac number, because 199999971 - 2³ = 199999963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199999899 and 199999908.

It is not an unprimeable number, because it can be changed into a prime (199999901) 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 11 ways as a sum of consecutive naturals, for example, 155856 + ... + 157133.

It is an arithmetic number, because the mean of its divisors is an integer number (24413220).

Almost surely, 2^199999971 is an apocalyptic number.

199999971 is a deficient number, since it is larger than the sum of its proper divisors (92958669).

199999971 is a wasteful number, since it uses less digits than its factorization.

199999971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313066 (or 313063 counting only the distinct ones).

The product of its digits is 3720087, while the sum is 63.

The square root of 199999971 is about 14142.1345984261. The cubic root of 199999971 is about 584.8035193771.

The spelling of 199999971 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-one".