1311131387 has 2 divisors, whose sum is σ = 1311131388. Its totient is φ = 1311131386.

The previous prime is 1311131303. The next prime is 1311131389. The reversal of 1311131387 is 7831311131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311131387 - 2¹⁸ = 1310869243 is a prime.

Together with 1311131389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1311131389) 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, 655565693 + 655565694.

It is an arithmetic number, because the mean of its divisors is an integer number (655565694).

Almost surely, 2^1311131387 is an apocalyptic number.

1311131387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311131387 is an equidigital number, since it uses as much as digits as its factorization.

1311131387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 1311131387 is about 36209.5482849483. The cubic root of 1311131387 is about 1094.4990896443.

The spelling of 1311131387 in words is "one billion, three hundred eleven million, one hundred thirty-one thousand, three hundred eighty-seven".