9991039936 has 28 divisors (see below), whose sum is σ = 19853635680. Its totient is φ = 4988549120.

The previous prime is 9991039913. The next prime is 9991039939. The reversal of 9991039936 is 6399301999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991039939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62545 + ... + 154576.

Almost surely, 2^9991039936 is an apocalyptic number.

It is an amenable number.

9991039936 is a deficient number, since it is larger than the sum of its proper divisors (9862595744).

9991039936 is a wasteful number, since it uses less digits than its factorization.

9991039936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217852 (or 217842 counting only the distinct ones).

The product of its (nonzero) digits is 3188646, while the sum is 58.

The square root of 9991039936 is about 99955.1896401583. The cubic root of 9991039936 is about 2153.7910353305.

The spelling of 9991039936 in words is "nine billion, nine hundred ninety-one million, thirty-nine thousand, nine hundred thirty-six".