991163424 has 96 divisors (see below), whose sum is σ = 2772161280. Its totient is φ = 309180672.

The previous prime is 991163377. The next prime is 991163429. The reversal of 991163424 is 424361199.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (991163429) 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, 148119 + ... + 154665.

It is an arithmetic number, because the mean of its divisors is an integer number (28876680).

Almost surely, 2^991163424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991163424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386080640).

991163424 is an abundant number, since it is smaller than the sum of its proper divisors (1780997856).

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

991163424 is a wasteful number, since it uses less digits than its factorization.

991163424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6662 (or 6654 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 991163424 is about 31482.7480376158. The cubic root of 991163424 is about 997.0457557017.

The spelling of 991163424 in words is "nine hundred ninety-one million, one hundred sixty-three thousand, four hundred twenty-four".