318328561 has 8 divisors (see below), whose sum is σ = 324950184. Its totient is φ = 311752320.

The previous prime is 318328537. The next prime is 318328589. The reversal of 318328561 is 165823813.

It can be written as a sum of positive squares in 4 ways, for example, as 16646400 + 301682161 = 4080^2 + 17369^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 318328561 - 2¹⁷ = 318197489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 318328561.

It is not an unprimeable number, because it can be changed into a prime (318328061) 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 7 ways as a sum of consecutive naturals, for example, 3015 + ... + 25411.

It is an arithmetic number, because the mean of its divisors is an integer number (40618773).

Almost surely, 2^318328561 is an apocalyptic number.

It is an amenable number.

318328561 is a deficient number, since it is larger than the sum of its proper divisors (6621623).

318328561 is a wasteful number, since it uses less digits than its factorization.

318328561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22691.

The product of its digits is 34560, while the sum is 37.

The square root of 318328561 is about 17841.7645147558. The cubic root of 318328561 is about 682.7974156708.

The spelling of 318328561 in words is "three hundred eighteen million, three hundred twenty-eight thousand, five hundred sixty-one".