1312304405 has 4 divisors (see below), whose sum is σ = 1574765292. Its totient is φ = 1049843520.

The previous prime is 1312304393. The next prime is 1312304417. The reversal of 1312304405 is 5044032131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5044032131 = 1697 ⋅2972323.

It is an interprime number because it is at equal distance from previous prime (1312304393) and next prime (1312304417).

It can be written as a sum of positive squares in 2 ways, for example, as 275593201 + 1036711204 = 16601^2 + 32198^2 .

It is not a de Polignac number, because 1312304405 - 2²⁶ = 1245195541 is a prime.

It is a Duffinian number.

It is a congruent 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, 131230436 + ... + 131230445.

It is an arithmetic number, because the mean of its divisors is an integer number (393691323).

Almost surely, 2^1312304405 is an apocalyptic number.

It is an amenable number.

1312304405 is a deficient number, since it is larger than the sum of its proper divisors (262460887).

1312304405 is an equidigital number, since it uses as much as digits as its factorization.

1312304405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262460886.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1312304405 is about 36225.7422974326. The cubic root of 1312304405 is about 1094.8253942036.

Adding to 1312304405 its reverse (5044032131), we get a palindrome (6356336536).

The spelling of 1312304405 in words is "one billion, three hundred twelve million, three hundred four thousand, four hundred five".