99947899 has 2 divisors, whose sum is σ = 99947900. Its totient is φ = 99947898.

The previous prime is 99947893. The next prime is 99947909. The reversal of 99947899 is 99874999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99947899 - 2¹¹ = 99945851 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99947899.

It is not a weakly prime, because it can be changed into another prime (99947893) 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, 49973949 + 49973950.

It is an arithmetic number, because the mean of its divisors is an integer number (49973950).

Almost surely, 2^99947899 is an apocalyptic number.

99947899 is a deficient number, since it is larger than the sum of its proper divisors (1).

99947899 is an equidigital number, since it uses as much as digits as its factorization.

99947899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 64.

The square root of 99947899 is about 9997.3946105973. The cubic root of 99947899 is about 464.0782588843.

Subtracting from 99947899 its reverse (99874999), we obtain a square (72900 = 270²).

The spelling of 99947899 in words is "ninety-nine million, nine hundred forty-seven thousand, eight hundred ninety-nine".