9990909899 has 2 divisors, whose sum is σ = 9990909900. Its totient is φ = 9990909898.

The previous prime is 9990909893. The next prime is 9990909931. The reversal of 9990909899 is 9989090999.

9990909899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9990909899 - 2¹² = 9990905803 is a prime.

It is not a weakly prime, because it can be changed into another prime (9990909893) 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, 4995454949 + 4995454950.

It is an arithmetic number, because the mean of its divisors is an integer number (4995454950).

Almost surely, 2^9990909899 is an apocalyptic number.

9990909899 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990909899 is an equidigital number, since it uses as much as digits as its factorization.

9990909899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The square root of 9990909899 is about 99954.5391615608. The cubic root of 9990909899 is about 2153.7816911667.

The spelling of 9990909899 in words is "nine billion, nine hundred ninety million, nine hundred nine thousand, eight hundred ninety-nine".