312091 has 4 divisors (see below), whose sum is σ = 336112. Its totient is φ = 288072.

The previous prime is 312089. The next prime is 312101. The reversal of 312091 is 190213.

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 312091 - 2¹ = 312089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312031) 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, 11991 + ... + 12016.

It is an arithmetic number, because the mean of its divisors is an integer number (84028).

2³¹²⁰⁹¹ is an apocalyptic number.

312091 is a deficient number, since it is larger than the sum of its proper divisors (24021).

312091 is a wasteful number, since it uses less digits than its factorization.

312091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24020.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 312091 is about 558.6510538789. The cubic root of 312091 is about 67.8308222416.

The spelling of 312091 in words is "three hundred twelve thousand, ninety-one".