1311230939 has 2 divisors, whose sum is σ = 1311230940. Its totient is φ = 1311230938.

The previous prime is 1311230933. The next prime is 1311230959. The reversal of 1311230939 is 9390321131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311230939 - 2¹⁶ = 1311165403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311230933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655615469 + 655615470.

It is an arithmetic number, because the mean of its divisors is an integer number (655615470).

Almost surely, 2^1311230939 is an apocalyptic number.

1311230939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311230939 is an equidigital number, since it uses as much as digits as its factorization.

1311230939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 1311230939 is about 36210.9229238913. The cubic root of 1311230939 is about 1094.5267901013.

The spelling of 1311230939 in words is "one billion, three hundred eleven million, two hundred thirty thousand, nine hundred thirty-nine".