99599999 has 2 divisors, whose sum is σ = 99600000. Its totient is φ = 99599998.

The previous prime is 99599977. The next prime is 99600001. The reversal of 99599999 is 99999599.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99599999 is a prime.

Together with 99600001, it forms a pair of twin primes.

It is a Chen prime.

99599999 is a modest number, since divided by 9999 gives 9959 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99599299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49799999 + 49800000.

It is an arithmetic number, because the mean of its divisors is an integer number (49800000).

Almost surely, 2^99599999 is an apocalyptic number.

99599999 is a deficient number, since it is larger than the sum of its proper divisors (1).

99599999 is an equidigital number, since it uses as much as digits as its factorization.

99599999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23914845, while the sum is 68.

The square root of 99599999 is about 9979.9799097994. The cubic root of 99599999 is about 463.5391762888.

The spelling of 99599999 in words is "ninety-nine million, five hundred ninety-nine thousand, nine hundred ninety-nine".