311345 has 8 divisors (see below), whose sum is σ = 379176. Its totient is φ = 245376.

The previous prime is 311341. The next prime is 311347. The reversal of 311345 is 543113.

311345 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 4 ways, for example, as 2209 + 309136 = 47^2 + 556^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 311345 - 2² = 311341 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62 + ... + 791.

It is an arithmetic number, because the mean of its divisors is an integer number (47397).

2³¹¹³⁴⁵ is an apocalyptic number.

It is an amenable number.

311345 is a deficient number, since it is larger than the sum of its proper divisors (67831).

311345 is an equidigital number, since it uses as much as digits as its factorization.

311345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 180, while the sum is 17.

The square root of 311345 is about 557.9829746507. The cubic root of 311345 is about 67.7767331401.

Adding to 311345 its reverse (543113), we get a palindrome (854458).

It can be divided in two parts, 311 and 345, that added together give a palindrome (656).

The spelling of 311345 in words is "three hundred eleven thousand, three hundred forty-five".