1268563889 has 2 divisors, whose sum is σ = 1268563890. Its totient is φ = 1268563888.

The previous prime is 1268563883. The next prime is 1268563951. The reversal of 1268563889 is 9883658621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1117765489 + 150798400 = 33433^2 + 12280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268563889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1268563883) 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, 634281944 + 634281945.

It is an arithmetic number, because the mean of its divisors is an integer number (634281945).

Almost surely, 2^1268563889 is an apocalyptic number.

It is an amenable number.

1268563889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268563889 is an equidigital number, since it uses as much as digits as its factorization.

1268563889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 56.

The square root of 1268563889 is about 35616.9045398389. The cubic root of 1268563889 is about 1082.5237870773.

The spelling of 1268563889 in words is "one billion, two hundred sixty-eight million, five hundred sixty-three thousand, eight hundred eighty-nine".