318121 has 4 divisors (see below), whose sum is σ = 336852. Its totient is φ = 299392.

The previous prime is 318107. The next prime is 318127. The reversal of 318121 is 121813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121813 = 181 ⋅673.

It can be written as a sum of positive squares in 2 ways, for example, as 250000 + 68121 = 500^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 318121 - 2⁹ = 317609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 318095 and 318104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9340 + ... + 9373.

It is an arithmetic number, because the mean of its divisors is an integer number (84213).

2³¹⁸¹²¹ is an apocalyptic number.

It is an amenable number.

318121 is a deficient number, since it is larger than the sum of its proper divisors (18731).

318121 is a wasteful number, since it uses less digits than its factorization.

318121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18730.

The product of its digits is 48, while the sum is 16.

The square root of 318121 is about 564.0221626851. The cubic root of 318121 is about 68.2648981060.

Adding to 318121 its reverse (121813), we get a palindrome (439934).

It can be divided in two parts, 31812 and 1, that added together give a palindrome (31813).

The spelling of 318121 in words is "three hundred eighteen thousand, one hundred twenty-one".