12530631521 has 4 divisors (see below), whose sum is σ = 12559705344. Its totient is φ = 12501557700.

The previous prime is 12530631511. The next prime is 12530631563. The reversal of 12530631521 is 12513603521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12530631521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12530631511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14536265 + ... + 14537126.

It is an arithmetic number, because the mean of its divisors is an integer number (3139926336).

Almost surely, 2^12530631521 is an apocalyptic number.

It is an amenable number.

12530631521 is a deficient number, since it is larger than the sum of its proper divisors (29073823).

12530631521 is an equidigital number, since it uses as much as digits as its factorization.

12530631521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29073822.

The product of its (nonzero) digits is 5400, while the sum is 29.

The spelling of 12530631521 in words is "twelve billion, five hundred thirty million, six hundred thirty-one thousand, five hundred twenty-one".