545209 has 8 divisors (see below), whose sum is σ = 632448. Its totient is φ = 460320.

The previous prime is 545203. The next prime is 545213. The reversal of 545209 is 902545.

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

It is not a de Polignac number, because 545209 - 2¹¹ = 543161 is a prime.

It is a Duffinian number.

545209 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545203) 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, 52 + ... + 1045.

It is an arithmetic number, because the mean of its divisors is an integer number (79056).

2⁵⁴⁵²⁰⁹ is an apocalyptic number.

It is an amenable number.

545209 is a deficient number, since it is larger than the sum of its proper divisors (87239).

545209 is a wasteful number, since it uses less digits than its factorization.

545209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 545209 is about 738.3826921048. The cubic root of 545209 is about 81.6935318158.

The spelling of 545209 in words is "five hundred forty-five thousand, two hundred nine".