1273135568 has 10 divisors (see below), whose sum is σ = 2466700194. Its totient is φ = 636567776.

The previous prime is 1273135547. The next prime is 1273135579. The reversal of 1273135568 is 8655313721.

It can be written as a sum of positive squares in only one way, i.e., 642723904 + 630411664 = 25352^2 + 25108^2 .

It is a congruent number.

It is an unprimeable number.

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, 39785471 + ... + 39785502.

Almost surely, 2^1273135568 is an apocalyptic number.

It is an amenable number.

1273135568 is a deficient number, since it is larger than the sum of its proper divisors (1193564626).

1273135568 is an equidigital number, since it uses as much as digits as its factorization.

1273135568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79570981 (or 79570975 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 1273135568 is about 35681.0253215907. The cubic root of 1273135568 is about 1083.8226358869.

The spelling of 1273135568 in words is "one billion, two hundred seventy-three million, one hundred thirty-five thousand, five hundred sixty-eight".