1311313243 has 2 divisors, whose sum is σ = 1311313244. Its totient is φ = 1311313242.

The previous prime is 1311313231. The next prime is 1311313259. The reversal of 1311313243 is 3423131131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311313243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311313043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655656621 + 655656622.

It is an arithmetic number, because the mean of its divisors is an integer number (655656622).

Almost surely, 2^1311313243 is an apocalyptic number.

1311313243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311313243 is an equidigital number, since it uses as much as digits as its factorization.

1311313243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

The square root of 1311313243 is about 36212.0593587274. The cubic root of 1311313243 is about 1094.5496902240.

Adding to 1311313243 its reverse (3423131131), we get a palindrome (4734444374).

The spelling of 1311313243 in words is "one billion, three hundred eleven million, three hundred thirteen thousand, two hundred forty-three".