1271097857 has 2 divisors, whose sum is σ = 1271097858. Its totient is φ = 1271097856.

The previous prime is 1271097799. The next prime is 1271097859. The reversal of 1271097857 is 7587901721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 875923216 + 395174641 = 29596^2 + 19879^2 .

It is a cyclic number.

It is not a de Polignac number, because 1271097857 - 2⁸ = 1271097601 is a prime.

Together with 1271097859, 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 (1271097859) 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, 635548928 + 635548929.

It is an arithmetic number, because the mean of its divisors is an integer number (635548929).

Almost surely, 2^1271097857 is an apocalyptic number.

It is an amenable number.

1271097857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271097857 is an equidigital number, since it uses as much as digits as its factorization.

1271097857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246960, while the sum is 47.

The square root of 1271097857 is about 35652.4593401353. The cubic root of 1271097857 is about 1083.2440914153.

The spelling of 1271097857 in words is "one billion, two hundred seventy-one million, ninety-seven thousand, eight hundred fifty-seven".