9891172 has 12 divisors (see below), whose sum is σ = 18220720. Its totient is φ = 4685256.

The previous prime is 9891151. The next prime is 9891179. The reversal of 9891172 is 2711989.

It is not an unprimeable number, because it can be changed into a prime (9891179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64998 + ... + 65149.

Almost surely, 2^9891172 is an apocalyptic number.

It is an amenable number.

9891172 is a deficient number, since it is larger than the sum of its proper divisors (8329548).

9891172 is a wasteful number, since it uses less digits than its factorization.

9891172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130170 (or 130168 counting only the distinct ones).

The product of its digits is 9072, while the sum is 37.

The square root of 9891172 is about 3145.0233703424. The cubic root of 9891172 is about 214.6590738841.

The spelling of 9891172 in words is "nine million, eight hundred ninety-one thousand, one hundred seventy-two".