12513838481 has 4 divisors (see below), whose sum is σ = 12565763364. Its totient is φ = 12461913600.

The previous prime is 12513838471. The next prime is 12513838549. The reversal of 12513838481 is 18483831521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18483831521 = 43 ⋅429856547.

It can be written as a sum of positive squares in 2 ways, for example, as 6467376400 + 6046462081 = 80420^2 + 77759^2 .

It is a cyclic number.

It is not a de Polignac number, because 12513838481 - 2¹⁸ = 12513576337 is a prime.

It is a super-4 number, since 4×12513838481⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12513838451) 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, 25962080 + ... + 25962561.

It is an arithmetic number, because the mean of its divisors is an integer number (3141440841).

Almost surely, 2^12513838481 is an apocalyptic number.

It is an amenable number.

12513838481 is a deficient number, since it is larger than the sum of its proper divisors (51924883).

12513838481 is an equidigital number, since it uses as much as digits as its factorization.

12513838481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51924882.

The product of its digits is 184320, while the sum is 44.

The spelling of 12513838481 in words is "twelve billion, five hundred thirteen million, eight hundred thirty-eight thousand, four hundred eighty-one".