1318380779 has 2 divisors, whose sum is σ = 1318380780. Its totient is φ = 1318380778.

The previous prime is 1318380761. The next prime is 1318380823. The reversal of 1318380779 is 9770838131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1318380779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1318380979) 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, 659190389 + 659190390.

It is an arithmetic number, because the mean of its divisors is an integer number (659190390).

Almost surely, 2^1318380779 is an apocalyptic number.

1318380779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318380779 is an equidigital number, since it uses as much as digits as its factorization.

1318380779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 1318380779 is about 36309.5136155801. The cubic root of 1318380779 is about 1096.5125858470.

The spelling of 1318380779 in words is "one billion, three hundred eighteen million, three hundred eighty thousand, seven hundred seventy-nine".