1268355709 has 2 divisors, whose sum is σ = 1268355710. Its totient is φ = 1268355708.

The previous prime is 1268355689. The next prime is 1268355763. The reversal of 1268355709 is 9075538621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207562500 + 60793209 = 34750^2 + 7797^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268355709 - 2⁷ = 1268355581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268359709) 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, 634177854 + 634177855.

It is an arithmetic number, because the mean of its divisors is an integer number (634177855).

Almost surely, 2^1268355709 is an apocalyptic number.

It is an amenable number.

1268355709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268355709 is an equidigital number, since it uses as much as digits as its factorization.

1268355709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 1268355709 is about 35613.9819312584. The cubic root of 1268355709 is about 1082.4645673216.

The spelling of 1268355709 in words is "one billion, two hundred sixty-eight million, three hundred fifty-five thousand, seven hundred nine".