1311303243 has 8 divisors (see below), whose sum is σ = 1785604608. Its totient is φ = 855602024.

The previous prime is 1311303233. The next prime is 1311303247. The reversal of 1311303243 is 3423031131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311303243 - 2⁸ = 1311302987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311303247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4649871 + ... + 4650152.

It is an arithmetic number, because the mean of its divisors is an integer number (223200576).

Almost surely, 2^1311303243 is an apocalyptic number.

1311303243 is a deficient number, since it is larger than the sum of its proper divisors (474301365).

1311303243 is an equidigital number, since it uses as much as digits as its factorization.

1311303243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9300073.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 1311303243 is about 36211.9212829146. The cubic root of 1311303243 is about 1094.5469078925.

Adding to 1311303243 its reverse (3423031131), we get a palindrome (4734334374).

The spelling of 1311303243 in words is "one billion, three hundred eleven million, three hundred three thousand, two hundred forty-three".