9991082782 has 4 divisors (see below), whose sum is σ = 14986624176. Its totient is φ = 4995541390.

The previous prime is 9991082779. The next prime is 9991082789. The reversal of 9991082782 is 2872801999.

9991082782 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991082789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2497770694 + ... + 2497770697.

It is an arithmetic number, because the mean of its divisors is an integer number (3746656044).

Almost surely, 2^9991082782 is an apocalyptic number.

9991082782 is a deficient number, since it is larger than the sum of its proper divisors (4995541394).

9991082782 is a wasteful number, since it uses less digits than its factorization.

9991082782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995541393.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 9991082782 is about 99955.4039659687. The cubic root of 9991082782 is about 2153.7941141290.

The spelling of 9991082782 in words is "nine billion, nine hundred ninety-one million, eighty-two thousand, seven hundred eighty-two".