318289 has 2 divisors, whose sum is σ = 318290. Its totient is φ = 318288.

The previous prime is 318287. The next prime is 318299. The reversal of 318289 is 982813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173889 + 144400 = 417^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 318289 - 2¹ = 318287 is a prime.

Together with 318287, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 318289.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 318289.

It is not a weakly prime, because it can be changed into another prime (318281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159144 + 159145.

It is an arithmetic number, because the mean of its divisors is an integer number (159145).

2³¹⁸²⁸⁹ is an apocalyptic number.

It is an amenable number.

318289 is a deficient number, since it is larger than the sum of its proper divisors (1).

318289 is an equidigital number, since it uses as much as digits as its factorization.

318289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 318289 is about 564.1710733457. The cubic root of 318289 is about 68.2769129103.

The spelling of 318289 in words is "three hundred eighteen thousand, two hundred eighty-nine".