198039871 has 2 divisors, whose sum is σ = 198039872. Its totient is φ = 198039870.

The previous prime is 198039859. The next prime is 198039899. The reversal of 198039871 is 178930891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198039871 - 2¹¹ = 198037823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198039271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99019935 + 99019936.

It is an arithmetic number, because the mean of its divisors is an integer number (99019936).

Almost surely, 2^198039871 is an apocalyptic number.

198039871 is a deficient number, since it is larger than the sum of its proper divisors (1).

198039871 is an equidigital number, since it uses as much as digits as its factorization.

198039871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 198039871 is about 14072.6639624486. The cubic root of 198039871 is about 582.8867881226.

The spelling of 198039871 in words is "one hundred ninety-eight million, thirty-nine thousand, eight hundred seventy-one".