985509911 has 32 divisors (see below), whose sum is σ = 1087395840. Its totient is φ = 890562816.

The previous prime is 985509887. The next prime is 985509913. The reversal of 985509911 is 119905589.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985509911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985509913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7193435 + ... + 7193571.

It is an arithmetic number, because the mean of its divisors is an integer number (33981120).

Almost surely, 2^985509911 is an apocalyptic number.

985509911 is a deficient number, since it is larger than the sum of its proper divisors (101885929).

985509911 is a wasteful number, since it uses less digits than its factorization.

985509911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383.

The product of its (nonzero) digits is 145800, while the sum is 47.

The square root of 985509911 is about 31392.8321595870. The cubic root of 985509911 is about 995.1464515120.

The spelling of 985509911 in words is "nine hundred eighty-five million, five hundred nine thousand, nine hundred eleven".