131525221405540 has 24 divisors (see below), whose sum is σ = 285727205123640. Its totient is φ = 50795947577088.

The previous prime is 131525221405433. The next prime is 131525221405549. The reversal of 131525221405540 is 45504122525131.

It can be written as a sum of positive squares in 4 ways, for example, as 50603646413376 + 80921574992164 = 7113624^2 + 8995642^2 .

It is a junction number, because it is equal to n+sod(n) for n = 131525221405493 and 131525221405502.

It is not an unprimeable number, because it can be changed into a prime (131525221405549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113383810977 + ... + 113383812136.

It is an arithmetic number, because the mean of its divisors is an integer number (11905300213485).

Almost surely, 2^{131525221405540} is an apocalyptic number.

131525221405540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131525221405540 is an abundant number, since it is smaller than the sum of its proper divisors (154201983718100).

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

131525221405540 is a wasteful number, since it uses less digits than its factorization.

131525221405540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226767623151 (or 226767623149 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 131525221405540 in words is "one hundred thirty-one trillion, five hundred twenty-five billion, two hundred twenty-one million, four hundred five thousand, five hundred forty".