1286257897 has 2 divisors, whose sum is σ = 1286257898. Its totient is φ = 1286257896.

The previous prime is 1286257873. The next prime is 1286257949. The reversal of 1286257897 is 7987526821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 900960256 + 385297641 = 30016^2 + 19629^2 .

It is an emirp because it is prime and its reverse (7987526821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1286257897 - 2⁷ = 1286257769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280257897) 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, 643128948 + 643128949.

It is an arithmetic number, because the mean of its divisors is an integer number (643128949).

Almost surely, 2^1286257897 is an apocalyptic number.

It is an amenable number.

1286257897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286257897 is an equidigital number, since it uses as much as digits as its factorization.

1286257897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 55.

The square root of 1286257897 is about 35864.4377761593. The cubic root of 1286257897 is about 1087.5336027315.

The spelling of 1286257897 in words is "one billion, two hundred eighty-six million, two hundred fifty-seven thousand, eight hundred ninety-seven".