131511131440 has 160 divisors (see below), whose sum is σ = 346313834496. Its totient is φ = 46079953920.

The previous prime is 131511131399. The next prime is 131511131441. The reversal of 131511131440 is 44131115131.

It is not an unprimeable number, because it can be changed into a prime (131511131441) 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, 3016195 + ... + 3059485.

Almost surely, 2^131511131440 is an apocalyptic number.

131511131440 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 131511131440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173156917248).

131511131440 is an abundant number, since it is smaller than the sum of its proper divisors (214802703056).

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

131511131440 is a wasteful number, since it uses less digits than its factorization.

131511131440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43467 (or 43461 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 131511131440 its reverse (44131115131), we get a palindrome (175642246571).

The spelling of 131511131440 in words is "one hundred thirty-one billion, five hundred eleven million, one hundred thirty-one thousand, four hundred forty".