1263117857 has 2 divisors, whose sum is σ = 1263117858. Its totient is φ = 1263117856.

The previous prime is 1263117827. The next prime is 1263117859. The reversal of 1263117857 is 7587113621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 917120656 + 345997201 = 30284^2 + 18601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263117857 is a prime.

Together with 1263117859, 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 (1263117859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631558928 + 631558929.

It is an arithmetic number, because the mean of its divisors is an integer number (631558929).

Almost surely, 2^1263117857 is an apocalyptic number.

It is an amenable number.

1263117857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263117857 is an equidigital number, since it uses as much as digits as its factorization.

1263117857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 1263117857 is about 35540.3693987556. The cubic root of 1263117857 is about 1080.9724486037.

The spelling of 1263117857 in words is "one billion, two hundred sixty-three million, one hundred seventeen thousand, eight hundred fifty-seven".