312111 has 6 divisors (see below), whose sum is σ = 450840. Its totient is φ = 208068.

The previous prime is 312107. The next prime is 312121. The reversal of 312111 is 111213.

312111 is nontrivially palindromic in base 15.

It is not a de Polignac number, because 312111 - 2² = 312107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 34679 = 312111 / (3 + 1 + 2 + 1 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 312093 and 312102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17331 + ... + 17348.

It is an arithmetic number, because the mean of its divisors is an integer number (75140).

2³¹²¹¹¹ is an apocalyptic number.

312111 is a deficient number, since it is larger than the sum of its proper divisors (138729).

312111 is a wasteful number, since it uses less digits than its factorization.

312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34685 (or 34682 counting only the distinct ones).

The product of its digits is 6, while the sum is 9.

The square root of 312111 is about 558.6689538537. The cubic root of 312111 is about 67.8322711645.

Adding to 312111 its reverse (111213), we get a palindrome (423324).

The spelling of 312111 in words is "three hundred twelve thousand, one hundred eleven", and thus it is an iban number.