9991111224 has 64 divisors (see below), whose sum is σ = 25224877440. Its totient is φ = 3297584000.

The previous prime is 9991111223. The next prime is 9991111231. The reversal of 9991111224 is 4221111999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991111223) 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, 1037359 + ... + 1046945.

It is an arithmetic number, because the mean of its divisors is an integer number (394138710).

Almost surely, 2^9991111224 is an apocalyptic number.

It is an amenable number.

9991111224 is an abundant number, since it is smaller than the sum of its proper divisors (15233766216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9991111224 is a wasteful number, since it uses less digits than its factorization.

9991111224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10020 (or 10016 counting only the distinct ones).

The product of its digits is 11664, while the sum is 39.

The square root of 9991111224 is about 99955.5462393158. The cubic root of 9991111224 is about 2153.7961578900.

The spelling of 9991111224 in words is "nine billion, nine hundred ninety-one million, one hundred eleven thousand, two hundred twenty-four".