9991594836 has 48 divisors (see below), whose sum is σ = 26232057600. Its totient is φ = 3288370176.

The previous prime is 9991594831. The next prime is 9991594843. The reversal of 9991594836 is 6384951999.

9991594836 is a `hidden beast` number, since 9 + 9 + 9 + 1 + 594 + 8 + 36 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991594831) 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, 577005 + ... + 594068.

It is an arithmetic number, because the mean of its divisors is an integer number (546501200).

Almost surely, 2^9991594836 is an apocalyptic number.

It is an amenable number.

9991594836 is an abundant number, since it is smaller than the sum of its proper divisors (16240462764).

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

9991594836 is a wasteful number, since it uses less digits than its factorization.

9991594836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171165 (or 1171157 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The square root of 9991594836 is about 99957.9653454391. The cubic root of 9991594836 is about 2153.8309082742.

The spelling of 9991594836 in words is "nine billion, nine hundred ninety-one million, five hundred ninety-four thousand, eight hundred thirty-six".