12531312113 has 2 divisors, whose sum is σ = 12531312114. Its totient is φ = 12531312112.

The previous prime is 12531312091. The next prime is 12531312121. The reversal of 12531312113 is 31121313521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6738275569 + 5793036544 = 82087^2 + 76112^2 .

It is a cyclic number.

It is not a de Polignac number, because 12531312113 - 2⁸ = 12531311857 is a prime.

It is not a weakly prime, because it can be changed into another prime (12531312163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6265656056 + 6265656057.

It is an arithmetic number, because the mean of its divisors is an integer number (6265656057).

Almost surely, 2^12531312113 is an apocalyptic number.

It is an amenable number.

12531312113 is a deficient number, since it is larger than the sum of its proper divisors (1).

12531312113 is an equidigital number, since it uses as much as digits as its factorization.

12531312113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 23.

Adding to 12531312113 its reverse (31121313521), we get a palindrome (43652625634).

The spelling of 12531312113 in words is "twelve billion, five hundred thirty-one million, three hundred twelve thousand, one hundred thirteen".