318981 has 8 divisors (see below), whose sum is σ = 458080. Its totient is φ = 196272.

The previous prime is 318979. The next prime is 319001. The reversal of 318981 is 189813.

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

It is not a de Polignac number, because 318981 - 2¹ = 318979 is a prime.

It is a super-2 number, since 2×318981² = 203497756722, which contains 22 as substring.

It is a Duffinian number.

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 318981.

It is not an unprimeable number, because it can be changed into a prime (318911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4051 + ... + 4128.

It is an arithmetic number, because the mean of its divisors is an integer number (57260).

2³¹⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

318981 is a deficient number, since it is larger than the sum of its proper divisors (139099).

318981 is a wasteful number, since it uses less digits than its factorization.

318981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8195.

The product of its digits is 1728, while the sum is 30.

The square root of 318981 is about 564.7840295192. The cubic root of 318981 is about 68.3263579369.

The spelling of 318981 in words is "three hundred eighteen thousand, nine hundred eighty-one".