99999959 has 2 divisors, whose sum is σ = 99999960.
Its totient is φ = 99999958.
The previous prime is 99999941. The next prime is 99999971. The reversal of 99999959 is 95999999.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 99999959 - 28 = 99999703 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99999989) 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, 49999979 + 49999980.
It is an arithmetic number, because the mean of its divisors is an integer number (49999980).
Almost surely, 299999959 is an apocalyptic number.
99999959 is a deficient number, since it is larger than the sum of its proper divisors (1).
99999959 is an equidigital number, since it uses as much as digits as its factorization.
99999959 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 23914845, while the sum is 68.
The square root of 99999959 is about 9999.9979499998.
The cubic root of 99999959 is about 464.1588199262.
The spelling of 99999959 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-nine".