199871983 has 2 divisors, whose sum is σ = 199871984. Its totient is φ = 199871982.

The previous prime is 199871977. The next prime is 199871989. The reversal of 199871983 is 389178991.

It is a balanced prime because it is at equal distance from previous prime (199871977) and next prime (199871989).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199871983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199871989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99935991 + 99935992.

It is an arithmetic number, because the mean of its divisors is an integer number (99935992).

Almost surely, 2^199871983 is an apocalyptic number.

199871983 is a deficient number, since it is larger than the sum of its proper divisors (1).

199871983 is an equidigital number, since it uses as much as digits as its factorization.

199871983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 55.

The square root of 199871983 is about 14137.6088147890. The cubic root of 199871983 is about 584.6787463514.

The spelling of 199871983 in words is "one hundred ninety-nine million, eight hundred seventy-one thousand, nine hundred eighty-three".