206545 has 8 divisors (see below), whose sum is σ = 250920. Its totient is φ = 163200.

The previous prime is 206543. The next prime is 206551. The reversal of 206545 is 545602.

206545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 118336 + 88209 = 344^2 + 297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206545 - 2¹ = 206543 is a prime.

206545 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (206543) 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, 301 + ... + 709.

It is an arithmetic number, because the mean of its divisors is an integer number (31365).

2²⁰⁶⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

206545 is a deficient number, since it is larger than the sum of its proper divisors (44375).

206545 is a wasteful number, since it uses less digits than its factorization.

206545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 206545 is about 454.4722213733. The cubic root of 206545 is about 59.1114431057. Note that the first 3 decimals are identical.

The spelling of 206545 in words is "two hundred six thousand, five hundred forty-five".