4131531521 has 16 divisors (see below), whose sum is σ = 4482288720. Its totient is φ = 3785564160.

The previous prime is 4131531499. The next prime is 4131531623. The reversal of 4131531521 is 1251351314.

It can be written as a sum of positive squares in 8 ways, for example, as 1446737296 + 2684794225 = 38036^2 + 51815^2 .

It is a cyclic number.

It is not a de Polignac number, because 4131531521 - 2¹⁸ = 4131269377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4134531521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1582265 + ... + 1584873.

It is an arithmetic number, because the mean of its divisors is an integer number (280143045).

Almost surely, 2^4131531521 is an apocalyptic number.

It is an amenable number.

4131531521 is a deficient number, since it is larger than the sum of its proper divisors (350757199).

4131531521 is a wasteful number, since it uses less digits than its factorization.

4131531521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476.

The product of its digits is 1800, while the sum is 26.

The square root of 4131531521 is about 64276.9906031700. The cubic root of 4131531521 is about 1604.6131864164.

Adding to 4131531521 its reverse (1251351314), we get a palindrome (5382882835).

The spelling of 4131531521 in words is "four billion, one hundred thirty-one million, five hundred thirty-one thousand, five hundred twenty-one".