1309389317 has 4 divisors (see below), whose sum is σ = 1386412236. Its totient is φ = 1232366400.

The previous prime is 1309389307. The next prime is 1309389331. The reversal of 1309389317 is 7139839031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 932019841 + 377369476 = 30529^2 + 19426^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309389317 - 2⁸ = 1309389061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309389307) 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 in 3 ways as a sum of consecutive naturals, for example, 38511434 + ... + 38511467.

It is an arithmetic number, because the mean of its divisors is an integer number (346603059).

Almost surely, 2^1309389317 is an apocalyptic number.

1309389317 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1309389317 is a deficient number, since it is larger than the sum of its proper divisors (77022919).

1309389317 is an equidigital number, since it uses as much as digits as its factorization.

1309389317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77022918.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1309389317 is about 36185.4848938079. The cubic root of 1309389317 is about 1094.0141295730.

The spelling of 1309389317 in words is "one billion, three hundred nine million, three hundred eighty-nine thousand, three hundred seventeen".