545185 has 4 divisors (see below), whose sum is σ = 654228. Its totient is φ = 436144.

The previous prime is 545161. The next prime is 545189. The reversal of 545185 is 581545.

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 88209 + 456976 = 297^2 + 676^2 .

It is a cyclic number.

It is not a de Polignac number, because 545185 - 2⁷ = 545057 is a prime.

It is a Duffinian number.

545185 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (545189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54514 + ... + 54523.

It is an arithmetic number, because the mean of its divisors is an integer number (163557).

2⁵⁴⁵¹⁸⁵ is an apocalyptic number.

It is an amenable number.

545185 is a deficient number, since it is larger than the sum of its proper divisors (109043).

545185 is a wasteful number, since it uses less digits than its factorization.

545185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109042.

The product of its digits is 4000, while the sum is 28.

The square root of 545185 is about 738.3664401908. The cubic root of 545185 is about 81.6923330868.

The spelling of 545185 in words is "five hundred forty-five thousand, one hundred eighty-five".