885991 has 2 divisors, whose sum is σ = 885992. Its totient is φ = 885990.

The previous prime is 885977. The next prime is 886007. The reversal of 885991 is 199588.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 885991 - 2⁵ = 885959 is a prime.

885991 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (885931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 442995 + 442996.

It is an arithmetic number, because the mean of its divisors is an integer number (442996).

2⁸⁸⁵⁹⁹¹ is an apocalyptic number.

885991 is a deficient number, since it is larger than the sum of its proper divisors (1).

885991 is an equidigital number, since it uses as much as digits as its factorization.

885991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 40.

The square root of 885991 is about 941.2709493021. The cubic root of 885991 is about 96.0453706257.

The spelling of 885991 in words is "eight hundred eighty-five thousand, nine hundred ninety-one".