99399899 has 2 divisors, whose sum is σ = 99399900. Its totient is φ = 99399898.

The previous prime is 99399889. The next prime is 99399941. The reversal of 99399899 is 99899399.

It is a weak prime.

It is an emirp because it is prime and its reverse (99899399) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99399899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99399889) 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, 49699949 + 49699950.

It is an arithmetic number, because the mean of its divisors is an integer number (49699950).

Almost surely, 2^99399899 is an apocalyptic number.

99399899 is a deficient number, since it is larger than the sum of its proper divisors (1).

99399899 is an equidigital number, since it uses as much as digits as its factorization.

99399899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12754584, while the sum is 65.

The square root of 99399899 is about 9969.9497992718. The cubic root of 99399899 is about 463.2285458503.

Subtracting 99399899 from its reverse (99899399), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 99399899 in words is "ninety-nine million, three hundred ninety-nine thousand, eight hundred ninety-nine".