1311323239 has 2 divisors, whose sum is σ = 1311323240. Its totient is φ = 1311323238.

The previous prime is 1311323207. The next prime is 1311323261. The reversal of 1311323239 is 9323231131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311323239 - 2⁵ = 1311323207 is a prime.

It is a super-2 number, since 2×1311323239² = 3439137274282902242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311323539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655661619 + 655661620.

It is an arithmetic number, because the mean of its divisors is an integer number (655661620).

Almost surely, 2^1311323239 is an apocalyptic number.

1311323239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311323239 is an equidigital number, since it uses as much as digits as its factorization.

1311323239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 28.

The square root of 1311323239 is about 36212.1973787839. The cubic root of 1311323239 is about 1094.5524714285.

The spelling of 1311323239 in words is "one billion, three hundred eleven million, three hundred twenty-three thousand, two hundred thirty-nine".