1306668791 has 2 divisors, whose sum is σ = 1306668792. Its totient is φ = 1306668790.

The previous prime is 1306668787. The next prime is 1306668793. The reversal of 1306668791 is 1978666031.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1306668791 - 2² = 1306668787 is a prime.

It is a Sophie Germain prime.

Together with 1306668793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1306668793) 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, 653334395 + 653334396.

It is an arithmetic number, because the mean of its divisors is an integer number (653334396).

Almost surely, 2^1306668791 is an apocalyptic number.

1306668791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1306668791 is an equidigital number, since it uses as much as digits as its factorization.

1306668791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1306668791 is about 36147.8739485464. The cubic root of 1306668791 is about 1093.2559243253.

The spelling of 1306668791 in words is "one billion, three hundred six million, six hundred sixty-eight thousand, seven hundred ninety-one".