199630171 has 32 divisors (see below), whose sum is σ = 231154560. Its totient is φ = 171085824.

The previous prime is 199630159. The next prime is 199630177. The reversal of 199630171 is 171036991.

199630171 is a nontrivial binomial coefficient, being equal to C(19982, 2).

It is not a de Polignac number, because 199630171 - 2⁹ = 199629659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199630171.

It is not an unprimeable number, because it can be changed into a prime (199630177) 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 31 ways as a sum of consecutive naturals, for example, 1938106 + ... + 1938208.

It is an arithmetic number, because the mean of its divisors is an integer number (7223580).

Almost surely, 2^199630171 is an apocalyptic number.

199630171 is the 19981-st triangular number and also the 9991-st hexagonal number.

199630171 is the 6661-st centered nonagonal number.

199630171 is a deficient number, since it is larger than the sum of its proper divisors (31524389).

199630171 is a wasteful number, since it uses less digits than its factorization.

199630171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 199630171 is about 14129.0541438555. The cubic root of 199630171 is about 584.4428630464.

The spelling of 199630171 in words is "one hundred ninety-nine million, six hundred thirty thousand, one hundred seventy-one".