545309 has 4 divisors (see below), whose sum is σ = 577404. Its totient is φ = 513216.

The previous prime is 545291. The next prime is 545329. The reversal of 545309 is 903545.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504100 + 41209 = 710^2 + 203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545329) 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, 16022 + ... + 16055.

It is an arithmetic number, because the mean of its divisors is an integer number (144351).

2⁵⁴⁵³⁰⁹ is an apocalyptic number.

It is an amenable number.

545309 is a deficient number, since it is larger than the sum of its proper divisors (32095).

545309 is a wasteful number, since it uses less digits than its factorization.

545309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32094.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 545309 is about 738.4504045635. The cubic root of 545309 is about 81.6985261414.

The spelling of 545309 in words is "five hundred forty-five thousand, three hundred nine".