11531221525 has 12 divisors (see below), whose sum is σ = 14304398944. Its totient is φ = 9221310000.

The previous prime is 11531221523. The next prime is 11531221561. The reversal of 11531221525 is 52512213511.

It is a happy number.

11531221525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11531221525 - 2¹ = 11531221523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11531221493 and 11531221502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531221523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26631 + ... + 154180.

Almost surely, 2^11531221525 is an apocalyptic number.

It is an amenable number.

11531221525 is a deficient number, since it is larger than the sum of its proper divisors (2773177419).

11531221525 is a wasteful number, since it uses less digits than its factorization.

11531221525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183372 (or 183367 counting only the distinct ones).

The product of its digits is 3000, while the sum is 28.

The spelling of 11531221525 in words is "eleven billion, five hundred thirty-one million, two hundred twenty-one thousand, five hundred twenty-five".