985911 has 4 divisors (see below), whose sum is σ = 1314552. Its totient is φ = 657272.

The previous prime is 985903. The next prime is 985921. The reversal of 985911 is 119589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119589 = 3 ⋅39863.

It is a cyclic number.

It is not a de Polignac number, because 985911 - 2³ = 985903 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164316 + ... + 164321.

It is an arithmetic number, because the mean of its divisors is an integer number (328638).

2⁹⁸⁵⁹¹¹ is an apocalyptic number.

985911 is a deficient number, since it is larger than the sum of its proper divisors (328641).

985911 is a wasteful number, since it uses less digits than its factorization.

985911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328640.

The product of its digits is 3240, while the sum is 33.

The square root of 985911 is about 992.9305111638. The cubic root of 985911 is about 99.5281436848.

It can be divided in two parts, 9859 and 11, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 985911 in words is "nine hundred eighty-five thousand, nine hundred eleven".