9981943 has 2 divisors, whose sum is σ = 9981944. Its totient is φ = 9981942.

The previous prime is 9981929. The next prime is 9982051. The reversal of 9981943 is 3491899.

9981943 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (3491899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9981943 - 2⁵ = 9981911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9981943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9981913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990971 + 4990972.

It is an arithmetic number, because the mean of its divisors is an integer number (4990972).

Almost surely, 2^9981943 is an apocalyptic number.

9981943 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981943 is an equidigital number, since it uses as much as digits as its factorization.

9981943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 9981943 is about 3159.4213077714. The cubic root of 9981943 is about 215.3137154492.

The spelling of 9981943 in words is "nine million, nine hundred eighty-one thousand, nine hundred forty-three".