9891481984388 has 12 divisors (see below), whose sum is σ = 17310142931340. Its totient is φ = 4945726861152.

The previous prime is 9891481984381. The next prime is 9891481984421. The reversal of 9891481984388 is 8834891841989.

It can be written as a sum of positive squares in 2 ways, for example, as 5692843297024 + 4198638687364 = 2385968^2 + 2049058^2 .

It is not an unprimeable number, because it can be changed into a prime (9891481984381) 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, 1870943 + ... + 4825286.

It is an arithmetic number, because the mean of its divisors is an integer number (1442511910945).

Almost surely, 2^{9891481984388} is an apocalyptic number.

It is an amenable number.

9891481984388 is a deficient number, since it is larger than the sum of its proper divisors (7418660946952).

9891481984388 is a wasteful number, since it uses less digits than its factorization.

9891481984388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065526 (or 7065524 counting only the distinct ones).

The product of its digits is 1146617856, while the sum is 80.

The spelling of 9891481984388 in words is "nine trillion, eight hundred ninety-one billion, four hundred eighty-one million, nine hundred eighty-four thousand, three hundred eighty-eight".