9999899993 has 2 divisors, whose sum is σ = 9999899994. Its totient is φ = 9999899992.

The previous prime is 9999899971. The next prime is 9999900017. The reversal of 9999899993 is 3999989999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7710947344 + 2288952649 = 87812^2 + 47843^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999899993 - 2⁸ = 9999899737 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999899933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999949996 + 4999949997.

It is an arithmetic number, because the mean of its divisors is an integer number (4999949997).

Almost surely, 2^9999899993 is an apocalyptic number.

It is an amenable number.

9999899993 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999899993 is an equidigital number, since it uses as much as digits as its factorization.

9999899993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1033121304, while the sum is 83.

The square root of 9999899993 is about 99999.4999637498. The cubic root of 9999899993 is about 2154.4275080563.

It can be divided in two parts, 99998 and 99993, that added together give a palindrome (199991).

The spelling of 9999899993 in words is "nine billion, nine hundred ninety-nine million, eight hundred ninety-nine thousand, nine hundred ninety-three".