99899999 has 2 divisors, whose sum is σ = 99900000. Its totient is φ = 99899998.

The previous prime is 99899981. The next prime is 99900001. The reversal of 99899999 is 99999899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99899999 - 2¹² = 99895903 is a prime.

Together with 99900001, it forms a pair of twin primes.

It is a Chen prime.

99899999 is a modest number, since divided by 9999 gives 9989 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99899909) 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, 49949999 + 49950000.

It is an arithmetic number, because the mean of its divisors is an integer number (49950000).

Almost surely, 2^99899999 is an apocalyptic number.

99899999 is a deficient number, since it is larger than the sum of its proper divisors (1).

99899999 is an equidigital number, since it uses as much as digits as its factorization.

99899999 is an odious number, because the sum of its binary digits is odd.

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

The square root of 99899999 is about 9994.9986993496. The cubic root of 99899999 is about 464.0041105834.

The spelling of 99899999 in words is "ninety-nine million, eight hundred ninety-nine thousand, nine hundred ninety-nine".