9981984011 has 4 divisors (see below), whose sum is σ = 10118723592. Its totient is φ = 9845244432.

The previous prime is 9981984007. The next prime is 9981984017. The reversal of 9981984011 is 1104891899.

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

It is a cyclic number.

It is not a de Polignac number, because 9981984011 - 2² = 9981984007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9981984017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68369681 + ... + 68369826.

It is an arithmetic number, because the mean of its divisors is an integer number (2529680898).

Almost surely, 2^9981984011 is an apocalyptic number.

9981984011 is a deficient number, since it is larger than the sum of its proper divisors (136739581).

9981984011 is a wasteful number, since it uses less digits than its factorization.

9981984011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136739580.

The product of its (nonzero) digits is 186624, while the sum is 50.

The square root of 9981984011 is about 99909.8794464291. The cubic root of 9981984011 is about 2153.1401032224.

The spelling of 9981984011 in words is "nine billion, nine hundred eighty-one million, nine hundred eighty-four thousand, eleven".