9981143 has 2 divisors, whose sum is σ = 9981144. Its totient is φ = 9981142.

The previous prime is 9981121. The next prime is 9981151. The reversal of 9981143 is 3411899.

9981143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9981143 - 2⁶ = 9981079 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9981043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990571 + 4990572.

It is an arithmetic number, because the mean of its divisors is an integer number (4990572).

Almost surely, 2^9981143 is an apocalyptic number.

9981143 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981143 is an equidigital number, since it uses as much as digits as its factorization.

9981143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 9981143 is about 3159.2946997708. The cubic root of 9981143 is about 215.3079632099.

The spelling of 9981143 in words is "nine million, nine hundred eighty-one thousand, one hundred forty-three".