199791983 has 2 divisors, whose sum is σ = 199791984. Its totient is φ = 199791982.

The previous prime is 199791919. The next prime is 199791997. The reversal of 199791983 is 389197991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199791983 - 2⁶ = 199791919 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 (199791883) 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, 99895991 + 99895992.

It is an arithmetic number, because the mean of its divisors is an integer number (99895992).

Almost surely, 2^199791983 is an apocalyptic number.

199791983 is a deficient number, since it is larger than the sum of its proper divisors (1).

199791983 is an equidigital number, since it uses as much as digits as its factorization.

199791983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 56.

The square root of 199791983 is about 14134.7791988414. The cubic root of 199791983 is about 584.6007288441.

The spelling of 199791983 in words is "one hundred ninety-nine million, seven hundred ninety-one thousand, nine hundred eighty-three".