231138618384 has 160 divisors (see below), whose sum is σ = 625559961600. Its totient is φ = 73453386240.

The previous prime is 231138618383. The next prime is 231138618409. The reversal of 231138618384 is 483816831132.

231138618384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (231138618383) 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 31 ways as a sum of consecutive naturals, for example, 59832037 + ... + 59835899.

It is an arithmetic number, because the mean of its divisors is an integer number (3909749760).

Almost surely, 2^231138618384 is an apocalyptic number.

231138618384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231138618384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312779980800).

231138618384 is an abundant number, since it is smaller than the sum of its proper divisors (394421343216).

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

231138618384 is a wasteful number, since it uses less digits than its factorization.

231138618384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493 (or 4487 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The spelling of 231138618384 in words is "two hundred thirty-one billion, one hundred thirty-eight million, six hundred eighteen thousand, three hundred eighty-four".