9998199943 has 2 divisors, whose sum is σ = 9998199944. Its totient is φ = 9998199942.

The previous prime is 9998199917. The next prime is 9998200013. The reversal of 9998199943 is 3499918999.

9998199943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (9998200013) can be obtained adding 9998199943 to its sum of digits (70).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9998199943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998199643) 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, 4999099971 + 4999099972.

It is an arithmetic number, because the mean of its divisors is an integer number (4999099972).

Almost surely, 2^9998199943 is an apocalyptic number.

9998199943 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998199943 is an equidigital number, since it uses as much as digits as its factorization.

9998199943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51018336, while the sum is 70.

The square root of 9998199943 is about 99990.9993099379. Note that the first 3 decimals coincide. The cubic root of 9998199943 is about 2154.3054120998.

The spelling of 9998199943 in words is "nine billion, nine hundred ninety-eight million, one hundred ninety-nine thousand, nine hundred forty-three".