311643 has 12 divisors (see below), whose sum is σ = 465088. Its totient is φ = 200880.

The previous prime is 311609. The next prime is 311653. The reversal of 311643 is 346113.

It is not a de Polignac number, because 311643 - 2¹⁴ = 295259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280 + ... + 837.

2³¹¹⁶⁴³ is an apocalyptic number.

311643 is a deficient number, since it is larger than the sum of its proper divisors (153445).

311643 is a wasteful number, since it uses less digits than its factorization.

311643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1151 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 311643 is about 558.2499440215. The cubic root of 311643 is about 67.7983501308.

Adding to 311643 its reverse (346113), we get a palindrome (657756).

The spelling of 311643 in words is "three hundred eleven thousand, six hundred forty-three".