311718 has 16 divisors (see below), whose sum is σ = 680256. Its totient is φ = 94440.

The previous prime is 311713. The next prime is 311737. The reversal of 311718 is 817113.

It is a super-2 number, since 2×311718² = 194336223048, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 311694 and 311703.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 311718.

It is not an unprimeable number, because it can be changed into a prime (311711) by changing a digit.

311718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2296 + ... + 2427.

It is an arithmetic number, because the mean of its divisors is an integer number (42516).

2³¹¹⁷¹⁸ is an apocalyptic number.

311718 is an abundant number, since it is smaller than the sum of its proper divisors (368538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311718 is a wasteful number, since it uses less digits than its factorization.

311718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739.

The product of its digits is 168, while the sum is 21.

The square root of 311718 is about 558.3171141923. The cubic root of 311718 is about 67.8037884779.

The spelling of 311718 in words is "three hundred eleven thousand, seven hundred eighteen".