1313809909 has 2 divisors, whose sum is σ = 1313809910. Its totient is φ = 1313809908.

The previous prime is 1313809867. The next prime is 1313809969. The reversal of 1313809909 is 9099083131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 922640625 + 391169284 = 30375^2 + 19778^2 .

It is an emirp because it is prime and its reverse (9099083131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1313809909 - 2¹¹ = 1313807861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313809969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656904954 + 656904955.

It is an arithmetic number, because the mean of its divisors is an integer number (656904955).

Almost surely, 2^1313809909 is an apocalyptic number.

It is an amenable number.

1313809909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313809909 is an equidigital number, since it uses as much as digits as its factorization.

1313809909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 1313809909 is about 36246.5158187653. The cubic root of 1313809909 is about 1095.2439033283.

The spelling of 1313809909 in words is "one billion, three hundred thirteen million, eight hundred nine thousand, nine hundred nine".