1312613465 has 4 divisors (see below), whose sum is σ = 1575136164. Its totient is φ = 1050090768.

The previous prime is 1312613447. The next prime is 1312613479. The reversal of 1312613465 is 5643162131.

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 217533001 + 1095080464 = 14749^2 + 33092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312613465 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131261342 + ... + 131261351.

It is an arithmetic number, because the mean of its divisors is an integer number (393784041).

Almost surely, 2^1312613465 is an apocalyptic number.

It is an amenable number.

1312613465 is a deficient number, since it is larger than the sum of its proper divisors (262522699).

1312613465 is an equidigital number, since it uses as much as digits as its factorization.

1312613465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262522698.

The product of its digits is 12960, while the sum is 32.

The square root of 1312613465 is about 36230.0077974046. The cubic root of 1312613465 is about 1094.9113346749.

Adding to 1312613465 its reverse (5643162131), we get a palindrome (6955775596).

The spelling of 1312613465 in words is "one billion, three hundred twelve million, six hundred thirteen thousand, four hundred sixty-five".