99858989 has 2 divisors, whose sum is σ = 99858990. Its totient is φ = 99858988.

The previous prime is 99858961. The next prime is 99858991. The reversal of 99858989 is 98985899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99161764 + 697225 = 9958^2 + 835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99858989 is a prime.

It is a Sophie Germain prime.

Together with 99858991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99858949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49929494 + 49929495.

It is an arithmetic number, because the mean of its divisors is an integer number (49929495).

Almost surely, 2^99858989 is an apocalyptic number.

It is an amenable number.

99858989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99858989 is an equidigital number, since it uses as much as digits as its factorization.

99858989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16796160, while the sum is 65.

The square root of 99858989 is about 9992.9469627333. The cubic root of 99858989 is about 463.9406090378.

The spelling of 99858989 in words is "ninety-nine million, eight hundred fifty-eight thousand, nine hundred eighty-nine".