985217871 has 16 divisors (see below), whose sum is σ = 1433577600. Its totient is φ = 596879520.

The previous prime is 985217843. The next prime is 985217879. The reversal of 985217871 is 178712589.

It is a happy number.

It is not a de Polignac number, because 985217871 - 2⁵ = 985217839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 985217871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985217879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146836 + ... + 153398.

It is an arithmetic number, because the mean of its divisors is an integer number (89598600).

Almost surely, 2^985217871 is an apocalyptic number.

985217871 is a deficient number, since it is larger than the sum of its proper divisors (448359729).

985217871 is a wasteful number, since it uses less digits than its factorization.

985217871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11126.

The product of its digits is 282240, while the sum is 48.

The square root of 985217871 is about 31388.1804346795. The cubic root of 985217871 is about 995.0481432561.

The spelling of 985217871 in words is "nine hundred eighty-five million, two hundred seventeen thousand, eight hundred seventy-one".