317947909 has 4 divisors (see below), whose sum is σ = 328911660. Its totient is φ = 306984160.

The previous prime is 317947879. The next prime is 317947933. The reversal of 317947909 is 909749713.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909749713 = 17 ⋅53514689.

It can be written as a sum of positive squares in 2 ways, for example, as 191047684 + 126900225 = 13822^2 + 11265^2 .

It is a cyclic number.

It is not a de Polignac number, because 317947909 - 2⁷ = 317947781 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 (317947939) 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 in 3 ways as a sum of consecutive naturals, for example, 5481832 + ... + 5481889.

It is an arithmetic number, because the mean of its divisors is an integer number (82227915).

Almost surely, 2^317947909 is an apocalyptic number.

It is an amenable number.

317947909 is a deficient number, since it is larger than the sum of its proper divisors (10963751).

317947909 is a wasteful number, since it uses less digits than its factorization.

317947909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10963750.

The product of its (nonzero) digits is 428652, while the sum is 49.

The square root of 317947909 is about 17831.0938811953. The cubic root of 317947909 is about 682.5251478521.

The spelling of 317947909 in words is "three hundred seventeen million, nine hundred forty-seven thousand, nine hundred nine".