12613121031145 has 4 divisors (see below), whose sum is σ = 15135745237380. Its totient is φ = 10090496824912.

The previous prime is 12613121031143. The next prime is 12613121031157. The reversal of 12613121031145 is 54113012131621.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4724050086144 + 7889070945001 = 2173488^2 + 2808749^2 .

It is a cyclic number.

It is not a de Polignac number, because 12613121031145 - 2¹ = 12613121031143 is a prime.

It is a super-2 number, since 2×12613121031145² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12613121031143) 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, 1261312103110 + ... + 1261312103119.

It is an arithmetic number, because the mean of its divisors is an integer number (3783936309345).

Almost surely, 2^{12613121031145} is an apocalyptic number.

It is an amenable number.

12613121031145 is a deficient number, since it is larger than the sum of its proper divisors (2522624206235).

12613121031145 is an equidigital number, since it uses as much as digits as its factorization.

12613121031145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522624206234.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 12613121031145 its reverse (54113012131621), we get a palindrome (66726133162766).

The spelling of 12613121031145 in words is "twelve trillion, six hundred thirteen billion, one hundred twenty-one million, thirty-one thousand, one hundred forty-five".