199998971 has 2 divisors, whose sum is σ = 199998972. Its totient is φ = 199998970.

The previous prime is 199998941. The next prime is 199998989. The reversal of 199998971 is 179899991.

It is a strong prime.

It is an emirp because it is prime and its reverse (179899991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199998971 - 2⁶ = 199998907 is a prime.

It is a Chen prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (199998901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999485 + 99999486.

It is an arithmetic number, because the mean of its divisors is an integer number (99999486).

Almost surely, 2^199998971 is an apocalyptic number.

199998971 is a deficient number, since it is larger than the sum of its proper divisors (1).

199998971 is an equidigital number, since it uses as much as digits as its factorization.

199998971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3306744, while the sum is 62.

The square root of 199998971 is about 14142.0992430403. The cubic root of 199998971 is about 584.8025447028.

The spelling of 199998971 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, nine hundred seventy-one".