312811 has 4 divisors (see below), whose sum is σ = 315952. Its totient is φ = 309672.

The previous prime is 312799. The next prime is 312839. The reversal of 312811 is 118213.

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

It is a cyclic number.

It is not a de Polignac number, because 312811 - 2⁵ = 312779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1416 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (78988).

2³¹²⁸¹¹ is an apocalyptic number.

312811 is a deficient number, since it is larger than the sum of its proper divisors (3141).

312811 is a wasteful number, since it uses less digits than its factorization.

312811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3140.

The product of its digits is 48, while the sum is 16.

The square root of 312811 is about 559.2950920579. The cubic root of 312811 is about 67.8829445213.

The spelling of 312811 in words is "three hundred twelve thousand, eight hundred eleven".