99859 has 2 divisors, whose sum is σ = 99860. Its totient is φ = 99858.

The previous prime is 99839. The next prime is 99871. The reversal of 99859 is 95899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99859 - 2⁹ = 99347 is a prime.

It is a Chen prime.

99859 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (99809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49929 + 49930.

It is an arithmetic number, because the mean of its divisors is an integer number (49930).

2⁹⁹⁸⁵⁹ is an apocalyptic number.

99859 is a deficient number, since it is larger than the sum of its proper divisors (1).

99859 is an equidigital number, since it uses as much as digits as its factorization.

99859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 40.

The square root of 99859 is about 316.0047467998. The cubic root of 99859 is about 46.3940626073.

Adding to 99859 its sum of digits (40), we get a palindrome (99899).

The spelling of 99859 in words is "ninety-nine thousand, eight hundred fifty-nine".