643311 has 6 divisors (see below), whose sum is σ = 929240. Its totient is φ = 428868.

The previous prime is 643303. The next prime is 643369. The reversal of 643311 is 113346.

It is not a de Polignac number, because 643311 - 2³ = 643303 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643301) 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, 35731 + ... + 35748.

2⁶⁴³³¹¹ is an apocalyptic number.

643311 is a deficient number, since it is larger than the sum of its proper divisors (285929).

643311 is a wasteful number, since it uses less digits than its factorization.

643311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71485 (or 71482 counting only the distinct ones).

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

The square root of 643311 is about 802.0667054554. The cubic root of 643311 is about 86.3257431681.

Adding to 643311 its reverse (113346), we get a palindrome (756657).

It can be divided in two parts, 64 and 3311, that added together give a cube (3375 = 15³).

The spelling of 643311 in words is "six hundred forty-three thousand, three hundred eleven".