231324144440 has 32 divisors (see below), whose sum is σ = 525532531680. Its totient is φ = 91631309952.

The previous prime is 231324144439. The next prime is 231324144461. The reversal of 231324144440 is 44441423132.

It is a junction number, because it is equal to n+sod(n) for n = 231324144397 and 231324144406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28069199 + ... + 28077438.

It is an arithmetic number, because the mean of its divisors is an integer number (16422891615).

Almost surely, 2^231324144440 is an apocalyptic number.

231324144440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231324144440 is an abundant number, since it is smaller than the sum of its proper divisors (294208387240).

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

231324144440 is a wasteful number, since it uses less digits than its factorization.

231324144440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56146751 (or 56146747 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 231324144440 its reverse (44441423132), we get a palindrome (275765567572).

The spelling of 231324144440 in words is "two hundred thirty-one billion, three hundred twenty-four million, one hundred forty-four thousand, four hundred forty".