1312321033 has 4 divisors (see below), whose sum is σ = 1312487680. Its totient is φ = 1312154388.

The previous prime is 1312321019. The next prime is 1312321039. The reversal of 1312321033 is 3301232131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3301232131 = 1283 ⋅2573057.

It is a cyclic number.

It is not a de Polignac number, because 1312321033 - 2⁹ = 1312320521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312321033.

It is not an unprimeable number, because it can be changed into a prime (1312321039) 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, 70893 + ... + 87466.

It is an arithmetic number, because the mean of its divisors is an integer number (328121920).

Almost surely, 2^1312321033 is an apocalyptic number.

It is an amenable number.

1312321033 is a deficient number, since it is larger than the sum of its proper divisors (166647).

1312321033 is an equidigital number, since it uses as much as digits as its factorization.

1312321033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166646.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1312321033 is about 36225.9718020097. The cubic root of 1312321033 is about 1094.8300183034.

Adding to 1312321033 its reverse (3301232131), we get a palindrome (4613553164).

The spelling of 1312321033 in words is "one billion, three hundred twelve million, three hundred twenty-one thousand, thirty-three".