199966171 has 2 divisors, whose sum is σ = 199966172. Its totient is φ = 199966170.

The previous prime is 199966147. The next prime is 199966183. The reversal of 199966171 is 171669991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199966171 - 2¹⁹ = 199441883 is a prime.

It is not a weakly prime, because it can be changed into another prime (199963171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99983085 + 99983086.

It is an arithmetic number, because the mean of its divisors is an integer number (99983086).

Almost surely, 2^199966171 is an apocalyptic number.

199966171 is a deficient number, since it is larger than the sum of its proper divisors (1).

199966171 is an equidigital number, since it uses as much as digits as its factorization.

199966171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 49.

The square root of 199966171 is about 14140.9395373858. The cubic root of 199966171 is about 584.7705735847.

The spelling of 199966171 in words is "one hundred ninety-nine million, nine hundred sixty-six thousand, one hundred seventy-one".