206539 has 4 divisors (see below), whose sum is σ = 209520. Its totient is φ = 203560.

The previous prime is 206527. The next prime is 206543. The reversal of 206539 is 935602.

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 206539 - 2⁷ = 206411 is a prime.

It is a Duffinian number.

206539 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (206519) 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, 1384 + ... + 1525.

It is an arithmetic number, because the mean of its divisors is an integer number (52380).

2²⁰⁶⁵³⁹ is an apocalyptic number.

206539 is a deficient number, since it is larger than the sum of its proper divisors (2981).

206539 is an equidigital number, since it uses as much as digits as its factorization.

206539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 206539 is about 454.4656202619. The cubic root of 206539 is about 59.1108707170.

The spelling of 206539 in words is "two hundred six thousand, five hundred thirty-nine".