1312520645361 has 16 divisors (see below), whose sum is σ = 1774601951616. Its totient is φ = 862799473536.

The previous prime is 1312520645323. The next prime is 1312520645363. The reversal of 1312520645361 is 1635460252131.

It is a happy number.

It is not a de Polignac number, because 1312520645361 - 2¹⁴ = 1312520628977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312520645363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9043110 + ... + 9187103.

It is an arithmetic number, because the mean of its divisors is an integer number (110912621976).

Almost surely, 2^{1312520645361} is an apocalyptic number.

It is an amenable number.

1312520645361 is a deficient number, since it is larger than the sum of its proper divisors (462081306255).

1312520645361 is a wasteful number, since it uses less digits than its factorization.

1312520645361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18230552.

The product of its (nonzero) digits is 129600, while the sum is 39.

Adding to 1312520645361 its reverse (1635460252131), we get a palindrome (2947980897492).

The spelling of 1312520645361 in words is "one trillion, three hundred twelve billion, five hundred twenty million, six hundred forty-five thousand, three hundred sixty-one".