1268127857 has 2 divisors, whose sum is σ = 1268127858. Its totient is φ = 1268127856.

The previous prime is 1268127797. The next prime is 1268127859. The reversal of 1268127857 is 7587218621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267288801 + 839056 = 35599^2 + 916^2 .

It is an emirp because it is prime and its reverse (7587218621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1268127857 - 2¹² = 1268123761 is a prime.

Together with 1268127859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1268127859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634063928 + 634063929.

It is an arithmetic number, because the mean of its divisors is an integer number (634063929).

Almost surely, 2^1268127857 is an apocalyptic number.

It is an amenable number.

1268127857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268127857 is an equidigital number, since it uses as much as digits as its factorization.

1268127857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 47.

The square root of 1268127857 is about 35610.7828754157. The cubic root of 1268127857 is about 1082.3997441584.

The spelling of 1268127857 in words is "one billion, two hundred sixty-eight million, one hundred twenty-seven thousand, eight hundred fifty-seven".