545503 has 4 divisors (see below), whose sum is σ = 623440. Its totient is φ = 467568.

The previous prime is 545497. The next prime is 545521. The reversal of 545503 is 305545.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 545503 - 2¹⁷ = 414431 is a prime.

It is a Duffinian number.

545503 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38958 + ... + 38971.

It is an arithmetic number, because the mean of its divisors is an integer number (155860).

2⁵⁴⁵⁵⁰³ is an apocalyptic number.

545503 is a deficient number, since it is larger than the sum of its proper divisors (77937).

545503 is an equidigital number, since it uses as much as digits as its factorization.

545503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77936.

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 545503 is about 738.5817490299. The cubic root of 545503 is about 81.7082133920.

The spelling of 545503 in words is "five hundred forty-five thousand, five hundred three".