8331981813 has 24 divisors (see below), whose sum is σ = 12486650176. Its totient is φ = 5552064000.

The previous prime is 8331981811. The next prime is 8331981871. The reversal of 8331981813 is 3181891338.

It is not a de Polignac number, because 8331981813 - 2¹ = 8331981811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8331981811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 613173 + ... + 626613.

Almost surely, 2^8331981813 is an apocalyptic number.

It is an amenable number.

8331981813 is a deficient number, since it is larger than the sum of its proper divisors (4154668363).

8331981813 is a wasteful number, since it uses less digits than its factorization.

8331981813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16007 (or 15995 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 8331981813 is about 91279.6900356262. The cubic root of 8331981813 is about 2027.2910563365.

The spelling of 8331981813 in words is "eight billion, three hundred thirty-one million, nine hundred eighty-one thousand, eight hundred thirteen".