316805 has 4 divisors (see below), whose sum is σ = 380172. Its totient is φ = 253440.

The previous prime is 316801. The next prime is 316817. The reversal of 316805 is 508613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131044 + 185761 = 362^2 + 431^2 .

It is not a de Polignac number, because 316805 - 2² = 316801 is a prime.

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 316805.

It is not an unprimeable number, because it can be changed into a prime (316801) 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, 31676 + ... + 31685.

It is an arithmetic number, because the mean of its divisors is an integer number (95043).

2³¹⁶⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

316805 is a deficient number, since it is larger than the sum of its proper divisors (63367).

316805 is an equidigital number, since it uses as much as digits as its factorization.

316805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63366.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 316805 is about 562.8543328429. The cubic root of 316805 is about 68.1706354724.

The spelling of 316805 in words is "three hundred sixteen thousand, eight hundred five".