545605 has 4 divisors (see below), whose sum is σ = 654732. Its totient is φ = 436480.

The previous prime is 545599. The next prime is 545609. The reversal of 545605 is 506545.

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 174724 + 370881 = 418^2 + 609^2 .

It is not a de Polignac number, because 545605 - 2⁷ = 545477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545609) 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, 54556 + ... + 54565.

It is an arithmetic number, because the mean of its divisors is an integer number (163683).

2⁵⁴⁵⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

545605 is a deficient number, since it is larger than the sum of its proper divisors (109127).

545605 is a wasteful number, since it uses less digits than its factorization.

545605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109126.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 545605 is about 738.6507970618. The cubic root of 545605 is about 81.7133057676.

Subtracting from 545605 its reverse (506545), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 545605 in words is "five hundred forty-five thousand, six hundred five".