131531540444521 has 64 divisors (see below), whose sum is σ = 163913490432000. Its totient is φ = 105131078260992.

The previous prime is 131531540444497. The next prime is 131531540444527. The reversal of 131531540444521 is 125444045135131.

It is not a de Polignac number, because 131531540444521 - 2⁷ = 131531540444393 is a prime.

It is a super-2 number, since 2×131531540444521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131531540444527) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 547136670 + ... + 547377016.

It is an arithmetic number, because the mean of its divisors is an integer number (2561148288000).

Almost surely, 2^{131531540444521} is an apocalyptic number.

It is an amenable number.

131531540444521 is a deficient number, since it is larger than the sum of its proper divisors (32381949987479).

131531540444521 is a wasteful number, since it uses less digits than its factorization.

131531540444521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241251 (or 241237 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 43.

Adding to 131531540444521 its reverse (125444045135131), we get a palindrome (256975585579652).

The spelling of 131531540444521 in words is "one hundred thirty-one trillion, five hundred thirty-one billion, five hundred forty million, four hundred forty-four thousand, five hundred twenty-one".