1271255663 has 2 divisors, whose sum is σ = 1271255664. Its totient is φ = 1271255662.

The previous prime is 1271255659. The next prime is 1271255669. The reversal of 1271255663 is 3665521721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1271255663 - 2² = 1271255659 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271255669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635627831 + 635627832.

It is an arithmetic number, because the mean of its divisors is an integer number (635627832).

Almost surely, 2^1271255663 is an apocalyptic number.

1271255663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271255663 is an equidigital number, since it uses as much as digits as its factorization.

1271255663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 1271255663 is about 35654.6723866592. The cubic root of 1271255663 is about 1083.2889175847.

The spelling of 1271255663 in words is "one billion, two hundred seventy-one million, two hundred fifty-five thousand, six hundred sixty-three".