199869871 has 2 divisors, whose sum is σ = 199869872. Its totient is φ = 199869870.

The previous prime is 199869863. The next prime is 199869883. The reversal of 199869871 is 178968991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199869871 - 2³ = 199869863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199869851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99934935 + 99934936.

It is an arithmetic number, because the mean of its divisors is an integer number (99934936).

Almost surely, 2^199869871 is an apocalyptic number.

199869871 is a deficient number, since it is larger than the sum of its proper divisors (1).

199869871 is an equidigital number, since it uses as much as digits as its factorization.

199869871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 58.

The square root of 199869871 is about 14137.5341202064. The cubic root of 199869871 is about 584.6766869568.

The spelling of 199869871 in words is "one hundred ninety-nine million, eight hundred sixty-nine thousand, eight hundred seventy-one".