199801871 has 2 divisors, whose sum is σ = 199801872. Its totient is φ = 199801870.

The previous prime is 199801831. The next prime is 199801879. The reversal of 199801871 is 178108991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199801871 - 2⁶ = 199801807 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 (199801879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99900935 + 99900936.

It is an arithmetic number, because the mean of its divisors is an integer number (99900936).

Almost surely, 2^199801871 is an apocalyptic number.

199801871 is a deficient number, since it is larger than the sum of its proper divisors (1).

199801871 is an equidigital number, since it uses as much as digits as its factorization.

199801871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 44.

The square root of 199801871 is about 14135.1289700519. The cubic root of 199801871 is about 584.6103729359.

The spelling of 199801871 in words is "one hundred ninety-nine million, eight hundred one thousand, eight hundred seventy-one".