318161 has 2 divisors, whose sum is σ = 318162. Its totient is φ = 318160.

The previous prime is 318137. The next prime is 318173. The reversal of 318161 is 161813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309136 + 9025 = 556^2 + 95^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (318181) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159080 + 159081.

It is an arithmetic number, because the mean of its divisors is an integer number (159081).

2³¹⁸¹⁶¹ is an apocalyptic number.

It is an amenable number.

318161 is a deficient number, since it is larger than the sum of its proper divisors (1).

318161 is an equidigital number, since it uses as much as digits as its factorization.

318161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 20.

The square root of 318161 is about 564.0576211700. The cubic root of 318161 is about 68.2677591573.

Adding to 318161 its reverse (161813), we get a palindrome (479974).

It can be divided in two parts, 31 and 8161, that added together give a 13-th power (8192 = 2¹³).

The spelling of 318161 in words is "three hundred eighteen thousand, one hundred sixty-one".