9991254172 has 24 divisors (see below), whose sum is σ = 18149463360. Its totient is φ = 4809178560.

The previous prime is 9991254167. The next prime is 9991254173. The reversal of 9991254172 is 2714521999.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991254173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424147 + ... + 447082.

It is an arithmetic number, because the mean of its divisors is an integer number (756227640).

Almost surely, 2^9991254172 is an apocalyptic number.

It is an amenable number.

9991254172 is a deficient number, since it is larger than the sum of its proper divisors (8158209188).

9991254172 is a wasteful number, since it uses less digits than its factorization.

9991254172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871341 (or 871339 counting only the distinct ones).

The product of its digits is 408240, while the sum is 49.

The square root of 9991254172 is about 99956.2612946283. The cubic root of 9991254172 is about 2153.8064296665.

The spelling of 9991254172 in words is "nine billion, nine hundred ninety-one million, two hundred fifty-four thousand, one hundred seventy-two".