199971127 has 2 divisors, whose sum is σ = 199971128. Its totient is φ = 199971126.

The previous prime is 199971077. The next prime is 199971133. The reversal of 199971127 is 721179991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199971127 - 2⁷ = 199970999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199971137) 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, 99985563 + 99985564.

It is an arithmetic number, because the mean of its divisors is an integer number (99985564).

Almost surely, 2^199971127 is an apocalyptic number.

199971127 is a deficient number, since it is larger than the sum of its proper divisors (1).

199971127 is an equidigital number, since it uses as much as digits as its factorization.

199971127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 46.

The square root of 199971127 is about 14141.1147721812. The cubic root of 199971127 is about 584.7754045669.

The spelling of 199971127 in words is "one hundred ninety-nine million, nine hundred seventy-one thousand, one hundred twenty-seven".