231311244440 has 16 divisors (see below), whose sum is σ = 520450300080. Its totient is φ = 92524497760.

The previous prime is 231311244389. The next prime is 231311244449. The reversal of 231311244440 is 44442113132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231311244449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2891390516 + ... + 2891390595.

It is an arithmetic number, because the mean of its divisors is an integer number (32528143755).

Almost surely, 2^231311244440 is an apocalyptic number.

231311244440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231311244440 is an abundant number, since it is smaller than the sum of its proper divisors (289139055640).

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

231311244440 is a wasteful number, since it uses less digits than its factorization.

231311244440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782781122 (or 5782781118 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 231311244440 its reverse (44442113132), we get a palindrome (275753357572).

The spelling of 231311244440 in words is "two hundred thirty-one billion, three hundred eleven million, two hundred forty-four thousand, four hundred forty".