9990384517 has 2 divisors, whose sum is σ = 9990384518. Its totient is φ = 9990384516.

The previous prime is 9990384491. The next prime is 9990384533. The reversal of 9990384517 is 7154830999.

9990384517 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 can be written as a sum of positive squares in only one way, i.e., 7585364836 + 2405019681 = 87094^2 + 49041^2 .

It is a cyclic number.

It is not a de Polignac number, because 9990384517 - 2²³ = 9981995909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990384587) 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, 4995192258 + 4995192259.

It is an arithmetic number, because the mean of its divisors is an integer number (4995192259).

Almost surely, 2^9990384517 is an apocalyptic number.

It is an amenable number.

9990384517 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990384517 is an equidigital number, since it uses as much as digits as its factorization.

9990384517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 9990384517 is about 99951.9110222511. The cubic root of 9990384517 is about 2153.7439375827.

The spelling of 9990384517 in words is "nine billion, nine hundred ninety million, three hundred eighty-four thousand, five hundred seventeen".