1276540673 has 2 divisors, whose sum is σ = 1276540674. Its totient is φ = 1276540672.

The previous prime is 1276540667. The next prime is 1276540711. The reversal of 1276540673 is 3760456721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741636289 + 534904384 = 27233^2 + 23128^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276540673 - 2⁸ = 1276540417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1276540673.

It is not a weakly prime, because it can be changed into another prime (1276540073) 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, 638270336 + 638270337.

It is an arithmetic number, because the mean of its divisors is an integer number (638270337).

Almost surely, 2^1276540673 is an apocalyptic number.

It is an amenable number.

1276540673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276540673 is an equidigital number, since it uses as much as digits as its factorization.

1276540673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 1276540673 is about 35728.7093665584. The cubic root of 1276540673 is about 1084.7880330898.

The spelling of 1276540673 in words is "one billion, two hundred seventy-six million, five hundred forty thousand, six hundred seventy-three".