12531331624451 has 4 divisors (see below), whose sum is σ = 12532002090504. Its totient is φ = 12530661158400.

The previous prime is 12531331624373. The next prime is 12531331624457. The reversal of 12531331624451 is 15442613313521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12531331624451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12531331624399 and 12531331624408.

It is not an unprimeable number, because it can be changed into a prime (12531331624457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335204990 + ... + 335242371.

It is an arithmetic number, because the mean of its divisors is an integer number (3133000522626).

Almost surely, 2^{12531331624451} is an apocalyptic number.

12531331624451 is a deficient number, since it is larger than the sum of its proper divisors (670466053).

12531331624451 is an equidigital number, since it uses as much as digits as its factorization.

12531331624451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670466052.

The product of its digits is 259200, while the sum is 41.

Adding to 12531331624451 its reverse (15442613313521), we get a palindrome (27973944937972).

The spelling of 12531331624451 in words is "twelve trillion, five hundred thirty-one billion, three hundred thirty-one million, six hundred twenty-four thousand, four hundred fifty-one".