318287 has 2 divisors, whose sum is σ = 318288. Its totient is φ = 318286.

The previous prime is 318281. The next prime is 318289. The reversal of 318287 is 782813.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 318287 - 2⁴ = 318271 is a prime.

It is a super-2 number, since 2×318287² = 202613228738, which contains 22 as substring.

Together with 318289, it forms a pair of twin primes.

It is a Chen prime.

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 318287.

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, 159143 + 159144.

It is an arithmetic number, because the mean of its divisors is an integer number (159144).

2³¹⁸²⁸⁷ is an apocalyptic number.

318287 is a deficient number, since it is larger than the sum of its proper divisors (1).

318287 is an equidigital number, since it uses as much as digits as its factorization.

318287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 29.

The square root of 318287 is about 564.1693008309. The cubic root of 318287 is about 68.2767699017.

The spelling of 318287 in words is "three hundred eighteen thousand, two hundred eighty-seven".