9990990943 has 2 divisors, whose sum is σ = 9990990944. Its totient is φ = 9990990942.

The previous prime is 9990990871. The next prime is 9990990973. The reversal of 9990990943 is 3490990999.

9990990943 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 an emirp because it is prime and its reverse (3490990999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9990990943 - 2¹⁷ = 9990859871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990990973) 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, 4995495471 + 4995495472.

It is an arithmetic number, because the mean of its divisors is an integer number (4995495472).

Almost surely, 2^9990990943 is an apocalyptic number.

9990990943 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990990943 is an equidigital number, since it uses as much as digits as its factorization.

9990990943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6377292, while the sum is 61.

The square root of 9990990943 is about 99954.9445650389. The cubic root of 9990990943 is about 2153.7875148142.

The spelling of 9990990943 in words is "nine billion, nine hundred ninety million, nine hundred ninety thousand, nine hundred forty-three".