9117831985 has 8 divisors (see below), whose sum is σ = 10941950376. Its totient is φ = 7293897600.

The previous prime is 9117831979. The next prime is 9117832007. The reversal of 9117831985 is 5891387119.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1086625296 + 8031206689 = 32964^2 + 89617^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9117831985 - 2³ = 9117831977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112957 + ... + 176053.

It is an arithmetic number, because the mean of its divisors is an integer number (1367743797).

Almost surely, 2^9117831985 is an apocalyptic number.

It is an amenable number.

9117831985 is a deficient number, since it is larger than the sum of its proper divisors (1824118391).

9117831985 is a wasteful number, since it uses less digits than its factorization.

9117831985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92003.

The product of its digits is 544320, while the sum is 52.

The square root of 9117831985 is about 95487.3393963828. The cubic root of 9117831985 is about 2089.1222846980.

The spelling of 9117831985 in words is "nine billion, one hundred seventeen million, eight hundred thirty-one thousand, nine hundred eighty-five".