12521531413 has 4 divisors (see below), whose sum is σ = 12521895948. Its totient is φ = 12521166880.

The previous prime is 12521531401. The next prime is 12521531417. The reversal of 12521531413 is 31413512521.

12521531413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31413512521 = 79 ⋅397639399.

It can be written as a sum of positive squares in 2 ways, for example, as 9577166769 + 2944364644 = 97863^2 + 54262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12521531413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521531417) 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 3 ways as a sum of consecutive naturals, for example, 124678 + ... + 201463.

It is an arithmetic number, because the mean of its divisors is an integer number (3130473987).

Almost surely, 2^12521531413 is an apocalyptic number.

It is an amenable number.

12521531413 is a deficient number, since it is larger than the sum of its proper divisors (364535).

12521531413 is an equidigital number, since it uses as much as digits as its factorization.

12521531413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364534.

The product of its digits is 3600, while the sum is 28.

The spelling of 12521531413 in words is "twelve billion, five hundred twenty-one million, five hundred thirty-one thousand, four hundred thirteen".