643103 has 4 divisors (see below), whose sum is σ = 671088. Its totient is φ = 615120.

The previous prime is 643099. The next prime is 643121. The reversal of 643103 is 301346.

643103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643103 - 2² = 643099 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 13958 + ... + 14003.

It is an arithmetic number, because the mean of its divisors is an integer number (167772).

2⁶⁴³¹⁰³ is an apocalyptic number.

643103 is a deficient number, since it is larger than the sum of its proper divisors (27985).

643103 is a wasteful number, since it uses less digits than its factorization.

643103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27984.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 643103 is about 801.9370299469. The cubic root of 643103 is about 86.3164383424.

Adding to 643103 its reverse (301346), we get a palindrome (944449).

The spelling of 643103 in words is "six hundred forty-three thousand, one hundred three".