1268607817 has 2 divisors, whose sum is σ = 1268607818. Its totient is φ = 1268607816.

The previous prime is 1268607787. The next prime is 1268607889. The reversal of 1268607817 is 7187068621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 787419721 + 481188096 = 28061^2 + 21936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268607817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1268607217) 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, 634303908 + 634303909.

It is an arithmetic number, because the mean of its divisors is an integer number (634303909).

Almost surely, 2^1268607817 is an apocalyptic number.

It is an amenable number.

1268607817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268607817 is an equidigital number, since it uses as much as digits as its factorization.

1268607817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 1268607817 is about 35617.5212079673. The cubic root of 1268607817 is about 1082.5362821925.

The spelling of 1268607817 in words is "one billion, two hundred sixty-eight million, six hundred seven thousand, eight hundred seventeen".