1276315813 has 2 divisors, whose sum is σ = 1276315814. Its totient is φ = 1276315812.

The previous prime is 1276315739. The next prime is 1276315819. The reversal of 1276315813 is 3185136721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 681053409 + 595262404 = 26097^2 + 24398^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276315813 - 2¹³ = 1276307621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1276315819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638157906 + 638157907.

It is an arithmetic number, because the mean of its divisors is an integer number (638157907).

Almost surely, 2^1276315813 is an apocalyptic number.

It is an amenable number.

1276315813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276315813 is an equidigital number, since it uses as much as digits as its factorization.

1276315813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 1276315813 is about 35725.5624588333. The cubic root of 1276315813 is about 1084.7243349599.

The spelling of 1276315813 in words is "one billion, two hundred seventy-six million, three hundred fifteen thousand, eight hundred thirteen".