311686 has 8 divisors (see below), whose sum is σ = 472464. Its totient is φ = 154200.

The previous prime is 311683. The next prime is 311687. The reversal of 311686 is 686113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 311686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570 + ... + 973.

It is an arithmetic number, because the mean of its divisors is an integer number (59058).

2³¹¹⁶⁸⁶ is an apocalyptic number.

311686 is a deficient number, since it is larger than the sum of its proper divisors (160778).

311686 is a wasteful number, since it uses less digits than its factorization.

311686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646.

The product of its digits is 864, while the sum is 25.

The square root of 311686 is about 558.2884559079. The cubic root of 311686 is about 67.8014682232.

Adding to 311686 its reverse (686113), we get a palindrome (997799).

The spelling of 311686 in words is "three hundred eleven thousand, six hundred eighty-six".