9481391388 has 96 divisors (see below), whose sum is σ = 28217280000. Its totient is φ = 2696986368.

The previous prime is 9481391371. The next prime is 9481391389. The reversal of 9481391388 is 8831931849.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9481391389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143988 + ... + 199236.

It is an arithmetic number, because the mean of its divisors is an integer number (293930000).

Almost surely, 2^9481391388 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 9481391388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14108640000).

9481391388 is an abundant number, since it is smaller than the sum of its proper divisors (18735888612).

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

9481391388 is a wasteful number, since it uses less digits than its factorization.

9481391388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55496 (or 55488 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 9481391388 is about 97372.4364900047. The cubic root of 9481391388 is about 2116.5280321323.

The spelling of 9481391388 in words is "nine billion, four hundred eighty-one million, three hundred ninety-one thousand, three hundred eighty-eight".