199830871 has 2 divisors, whose sum is σ = 199830872. Its totient is φ = 199830870.

The previous prime is 199830863. The next prime is 199830901. The reversal of 199830871 is 178038991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199830871 - 2³ = 199830863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199830671) 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 as a sum of consecutive naturals, namely, 99915435 + 99915436.

It is an arithmetic number, because the mean of its divisors is an integer number (99915436).

Almost surely, 2^199830871 is an apocalyptic number.

199830871 is a deficient number, since it is larger than the sum of its proper divisors (1).

199830871 is an equidigital number, since it uses as much as digits as its factorization.

199830871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 199830871 is about 14136.1547458989. The cubic root of 199830871 is about 584.6386557552.

The spelling of 199830871 in words is "one hundred ninety-nine million, eight hundred thirty thousand, eight hundred seventy-one".