659543 has 4 divisors (see below), whose sum is σ = 662088. Its totient is φ = 657000.

The previous prime is 659539. The next prime is 659563. The reversal of 659543 is 345956.

It is a happy number.

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 659543 - 2² = 659539 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 (659513) 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, 833 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (165522).

2⁶⁵⁹⁵⁴³ is an apocalyptic number.

659543 is a deficient number, since it is larger than the sum of its proper divisors (2545).

659543 is a wasteful number, since it uses less digits than its factorization.

659543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544.

The product of its digits is 16200, while the sum is 32.

The square root of 659543 is about 812.1225277013. The cubic root of 659543 is about 87.0457767638.

The spelling of 659543 in words is "six hundred fifty-nine thousand, five hundred forty-three".