643113 has 8 divisors (see below), whose sum is σ = 952800. Its totient is φ = 428724.

The previous prime is 643099. The next prime is 643121. The reversal of 643113 is 311346.

It is not a de Polignac number, because 643113 - 2⁵ = 643081 is a prime.

It is a Curzon number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (643183) 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, 11883 + ... + 11936.

It is an arithmetic number, because the mean of its divisors is an integer number (119100).

2⁶⁴³¹¹³ is an apocalyptic number.

It is an amenable number.

643113 is a deficient number, since it is larger than the sum of its proper divisors (309687).

643113 is a wasteful number, since it uses less digits than its factorization.

643113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23828 (or 23822 counting only the distinct ones).

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

The square root of 643113 is about 801.9432648261. The cubic root of 643113 is about 86.3168857357.

Adding to 643113 its reverse (311346), we get a palindrome (954459).

The spelling of 643113 in words is "six hundred forty-three thousand, one hundred thirteen".