312665 has 4 divisors (see below), whose sum is σ = 375204. Its totient is φ = 250128.

The previous prime is 312643. The next prime is 312673. The reversal of 312665 is 566213.

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 177241 + 135424 = 421^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 312665 - 2⁶ = 312601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312665.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 312665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31262 + ... + 31271.

It is an arithmetic number, because the mean of its divisors is an integer number (93801).

2³¹²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

312665 is a deficient number, since it is larger than the sum of its proper divisors (62539).

312665 is an equidigital number, since it uses as much as digits as its factorization.

312665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62538.

The product of its digits is 1080, while the sum is 23.

The square root of 312665 is about 559.1645553860. The cubic root of 312665 is about 67.8723817510.

Adding to 312665 its reverse (566213), we get a palindrome (878878).

The spelling of 312665 in words is "three hundred twelve thousand, six hundred sixty-five".