985509 has 12 divisors (see below), whose sum is σ = 1626976. Its totient is φ = 563112.

The previous prime is 985499. The next prime is 985519. The reversal of 985509 is 905589.

985509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (985499) and next prime (985519).

It is not a de Polignac number, because 985509 - 2⁴ = 985493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7759 + ... + 7884.

2⁹⁸⁵⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

985509 is a deficient number, since it is larger than the sum of its proper divisors (641467).

985509 is a wasteful number, since it uses less digits than its factorization.

985509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15656 (or 15653 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 985509 is about 992.7280594402. The cubic root of 985509 is about 99.5146144876.

The spelling of 985509 in words is "nine hundred eighty-five thousand, five hundred nine".