318212317 has 4 divisors (see below), whose sum is σ = 321363036. Its totient is φ = 315061600.

The previous prime is 318212309. The next prime is 318212333. The reversal of 318212317 is 713212813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 713212813 = 101 ⋅7061513.

It can be written as a sum of positive squares in 2 ways, for example, as 299324601 + 18887716 = 17301^2 + 4346^2 .

It is a cyclic number.

It is not a de Polignac number, because 318212317 - 2³ = 318212309 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 (318212017) 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 in 3 ways as a sum of consecutive naturals, for example, 1575208 + ... + 1575409.

It is an arithmetic number, because the mean of its divisors is an integer number (80340759).

Almost surely, 2^318212317 is an apocalyptic number.

It is an amenable number.

318212317 is a deficient number, since it is larger than the sum of its proper divisors (3150719).

318212317 is a wasteful number, since it uses less digits than its factorization.

318212317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150718.

The product of its digits is 2016, while the sum is 28.

The square root of 318212317 is about 17838.5065798682. The cubic root of 318212317 is about 682.7142932036.

The spelling of 318212317 in words is "three hundred eighteen million, two hundred twelve thousand, three hundred seventeen".