545909 has 12 divisors (see below), whose sum is σ = 684684. Its totient is φ = 431424.

The previous prime is 545899. The next prime is 545911. The reversal of 545909 is 909545.

It can be written as a sum of positive squares in 2 ways, for example, as 305809 + 240100 = 553^2 + 490^2 .

It is not a de Polignac number, because 545909 - 2⁴ = 545893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209 + ... + 1065.

It is an arithmetic number, because the mean of its divisors is an integer number (57057).

2⁵⁴⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

545909 is a deficient number, since it is larger than the sum of its proper divisors (138775).

545909 is a wasteful number, since it uses less digits than its factorization.

545909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 545909 is about 738.8565489999. The cubic root of 545909 is about 81.7284792800.

The spelling of 545909 in words is "five hundred forty-five thousand, nine hundred nine".