131215264440 has 128 divisors (see below), whose sum is σ = 427162982400. Its totient is φ = 32052533760.

The previous prime is 131215264421. The next prime is 131215264441. The reversal of 131215264440 is 44462512131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131215264441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116680 + ... + 525399.

It is an arithmetic number, because the mean of its divisors is an integer number (3337210800).

Almost surely, 2^131215264440 is an apocalyptic number.

131215264440 is a gapful number since it is divisible by the number (10) 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 131215264440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213581491200).

131215264440 is an abundant number, since it is smaller than the sum of its proper divisors (295947717960).

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

131215264440 is a wasteful number, since it uses less digits than its factorization.

131215264440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642237 (or 642233 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 131215264440 its reverse (44462512131), we get a palindrome (175677776571).

The spelling of 131215264440 in words is "one hundred thirty-one billion, two hundred fifteen million, two hundred sixty-four thousand, four hundred forty".