318681 has 32 divisors (see below), whose sum is σ = 547200. Its totient is φ = 181440.

The previous prime is 318679. The next prime is 318683. The reversal of 318681 is 186813.

It is an interprime number because it is at equal distance from previous prime (318679) and next prime (318683).

It is not a de Polignac number, because 318681 - 2¹ = 318679 is a prime.

It is a super-2 number, since 2×318681² = 203115159522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 318681.

It is not an unprimeable number, because it can be changed into a prime (318683) 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 31 ways as a sum of consecutive naturals, for example, 8595 + ... + 8631.

It is an arithmetic number, because the mean of its divisors is an integer number (17100).

2³¹⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

318681 is a deficient number, since it is larger than the sum of its proper divisors (228519).

318681 is a wasteful number, since it uses less digits than its factorization.

318681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 80 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 318681 is about 564.5183787974. The cubic root of 318681 is about 68.3049310214.

It can be divided in two parts, 318 and 681, that added together give a palindrome (999).

The spelling of 318681 in words is "three hundred eighteen thousand, six hundred eighty-one".