1312004321 has 12 divisors (see below), whose sum is σ = 1386372132. Its totient is φ = 1241443584.

The previous prime is 1312004311. The next prime is 1312004339. The reversal of 1312004321 is 1234002131.

It can be written as a sum of positive squares in 2 ways, for example, as 839550625 + 472453696 = 28975^2 + 21736^2 .

It is not a de Polignac number, because 1312004321 - 2¹⁸ = 1311742177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312004321.

It is not an unprimeable number, because it can be changed into a prime (1312004311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 394361 + ... + 397673.

It is an arithmetic number, because the mean of its divisors is an integer number (115531011).

Almost surely, 2^1312004321 is an apocalyptic number.

It is an amenable number.

1312004321 is a deficient number, since it is larger than the sum of its proper divisors (74367811).

1312004321 is a wasteful number, since it uses less digits than its factorization.

1312004321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448 (or 4429 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1312004321 is about 36221.6001993286. The cubic root of 1312004321 is about 1094.7419367812.

Adding to 1312004321 its reverse (1234002131), we get a palindrome (2546006452).

The spelling of 1312004321 in words is "one billion, three hundred twelve million, four thousand, three hundred twenty-one".