99859999 has 2 divisors, whose sum is σ = 99860000. Its totient is φ = 99859998.

The previous prime is 99859979. The next prime is 99860017. The reversal of 99859999 is 99995899.

It is a strong prime.

It is an emirp because it is prime and its reverse (99995899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99859999 - 2¹¹ = 99857951 is a prime.

99859999 is a modest number, since divided by 9999 gives 9985 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99859909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49929999 + 49930000.

It is an arithmetic number, because the mean of its divisors is an integer number (49930000).

Almost surely, 2^99859999 is an apocalyptic number.

99859999 is a deficient number, since it is larger than the sum of its proper divisors (1).

99859999 is an equidigital number, since it uses as much as digits as its factorization.

99859999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21257640, while the sum is 67.

The square root of 99859999 is about 9992.9974982485. The cubic root of 99859999 is about 463.9421731715.

The spelling of 99859999 in words is "ninety-nine million, eight hundred fifty-nine thousand, nine hundred ninety-nine".