85999 has 2 divisors, whose sum is σ = 86000. Its totient is φ = 85998.

The previous prime is 85991. The next prime is 86011. The reversal of 85999 is 99958.

85999 is nontrivially palindromic in base 6.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85999 - 2³ = 85991 is a prime.

85999 is a modest number, since divided by 999 gives 85 as remainder.

85999 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42999 + 43000.

It is an arithmetic number, because the mean of its divisors is an integer number (43000).

2⁸⁵⁹⁹⁹ is an apocalyptic number.

85999 is a deficient number, since it is larger than the sum of its proper divisors (1).

85999 is an equidigital number, since it uses as much as digits as its factorization.

85999 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 85999 is about 293.2558609815. The cubic root of 85999 is about 44.1398785383.

The spelling of 85999 in words is "eighty-five thousand, nine hundred ninety-nine".