1268857841 has 2 divisors, whose sum is σ = 1268857842. Its totient is φ = 1268857840.

The previous prime is 1268857831. The next prime is 1268857847. The reversal of 1268857841 is 1487588621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1268784400 + 73441 = 35620^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268857841 - 2¹⁰ = 1268856817 is a prime.

It is a super-2 number, since 2×1268857841² = 3220000441334362562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1268857841.

It is not a weakly prime, because it can be changed into another prime (1268857847) 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, 634428920 + 634428921.

It is an arithmetic number, because the mean of its divisors is an integer number (634428921).

Almost surely, 2^1268857841 is an apocalyptic number.

It is an amenable number.

1268857841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268857841 is an equidigital number, since it uses as much as digits as its factorization.

1268857841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 860160, while the sum is 50.

The square root of 1268857841 is about 35621.0308806469. The cubic root of 1268857841 is about 1082.6073948639.

The spelling of 1268857841 in words is "one billion, two hundred sixty-eight million, eight hundred fifty-seven thousand, eight hundred forty-one".