231381819394944 has 128 divisors (see below), whose sum is σ = 641338027603200. Its totient is φ = 73772994932736.

The previous prime is 231381819394889. The next prime is 231381819394981. The reversal of 231381819394944 is 449493918183132.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (69).

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, 1263882487 + ... + 1264065545.

It is an arithmetic number, because the mean of its divisors is an integer number (5010453340650).

Almost surely, 2^{231381819394944} is an apocalyptic number.

231381819394944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231381819394944 is an abundant number, since it is smaller than the sum of its proper divisors (409956208208256).

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

231381819394944 is a wasteful number, since it uses less digits than its factorization.

231381819394944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326212 (or 326200 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 69.

The spelling of 231381819394944 in words is "two hundred thirty-one trillion, three hundred eighty-one billion, eight hundred nineteen million, three hundred ninety-four thousand, nine hundred forty-four".