9861011992 has 64 divisors (see below), whose sum is σ = 20084762880. Its totient is φ = 4511832192.

The previous prime is 9861011971. The next prime is 9861012011. The reversal of 9861011992 is 2991101689.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11167183 + ... + 11168065.

It is an arithmetic number, because the mean of its divisors is an integer number (313824420).

Almost surely, 2^9861011992 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 9861011992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10042381440).

9861011992 is an abundant number, since it is smaller than the sum of its proper divisors (10223750888).

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

9861011992 is a wasteful number, since it uses less digits than its factorization.

9861011992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712 (or 1708 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 46.

The square root of 9861011992 is about 99302.6283237257. The cubic root of 9861011992 is about 2144.4067338122.

The spelling of 9861011992 in words is "nine billion, eight hundred sixty-one million, eleven thousand, nine hundred ninety-two".