1312331243 has 2 divisors, whose sum is σ = 1312331244. Its totient is φ = 1312331242.

The previous prime is 1312331231. The next prime is 1312331297. The reversal of 1312331243 is 3421332131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312331243 - 2²⁰ = 1311282667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312331213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656165621 + 656165622.

It is an arithmetic number, because the mean of its divisors is an integer number (656165622).

Almost surely, 2^1312331243 is an apocalyptic number.

1312331243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312331243 is an equidigital number, since it uses as much as digits as its factorization.

1312331243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

The square root of 1312331243 is about 36226.1127227308. The cubic root of 1312331243 is about 1094.8328575948.

Adding to 1312331243 its reverse (3421332131), we get a palindrome (4733663374).

The spelling of 1312331243 in words is "one billion, three hundred twelve million, three hundred thirty-one thousand, two hundred forty-three".