9867971917 has 16 divisors (see below), whose sum is σ = 10663797760. Its totient is φ = 9101220912.

The previous prime is 9867971873. The next prime is 9867971941. The reversal of 9867971917 is 7191797689.

It is a cyclic number.

It is not a de Polignac number, because 9867971917 - 2²⁷ = 9733754189 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 (9867971947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231148 + ... + 270490.

It is an arithmetic number, because the mean of its divisors is an integer number (666487360).

Almost surely, 2^9867971917 is an apocalyptic number.

It is an amenable number.

9867971917 is a deficient number, since it is larger than the sum of its proper divisors (795825843).

9867971917 is a wasteful number, since it uses less digits than its factorization.

9867971917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39712.

The product of its digits is 12002256, while the sum is 64.

The square root of 9867971917 is about 99337.6661543848. Note that the first 3 decimals coincide. The cubic root of 9867971917 is about 2144.9111242365.

The spelling of 9867971917 in words is "nine billion, eight hundred sixty-seven million, nine hundred seventy-one thousand, nine hundred seventeen".