1312809073 has 2 divisors, whose sum is σ = 1312809074. Its totient is φ = 1312809072.

The previous prime is 1312809031. The next prime is 1312809077. The reversal of 1312809073 is 3709082131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1192182784 + 120626289 = 34528^2 + 10983^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312809073 - 2²¹ = 1310711921 is a prime.

It is a super-2 number, since 2×1312809073² = 3446935324302238658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1312809077) 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, 656404536 + 656404537.

It is an arithmetic number, because the mean of its divisors is an integer number (656404537).

Almost surely, 2^1312809073 is an apocalyptic number.

It is an amenable number.

1312809073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312809073 is an equidigital number, since it uses as much as digits as its factorization.

1312809073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1312809073 is about 36232.7072270345. The cubic root of 1312809073 is about 1094.9657205201.

The spelling of 1312809073 in words is "one billion, three hundred twelve million, eight hundred nine thousand, seventy-three".