31131320241440 has 48 divisors (see below), whose sum is σ = 73549484681400. Its totient is φ = 12452233390080.

The previous prime is 31131320241431. The next prime is 31131320241457. The reversal of 31131320241440 is 4414202313113.

It can be written as a sum of positive squares in 4 ways, for example, as 24680268869776 + 6451051371664 = 4967924^2 + 2539892^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4542770 + ... + 9104910.

Almost surely, 2^{31131320241440} is an apocalyptic number.

It is an amenable number.

31131320241440 is an abundant number, since it is smaller than the sum of its proper divisors (42418164439960).

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

31131320241440 is a wasteful number, since it uses less digits than its factorization.

31131320241440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604805 (or 4604797 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 31131320241440 its reverse (4414202313113), we get a palindrome (35545522554553).

The spelling of 31131320241440 in words is "thirty-one trillion, one hundred thirty-one billion, three hundred twenty million, two hundred forty-one thousand, four hundred forty".