545021 has 4 divisors (see below), whose sum is σ = 552000. Its totient is φ = 538044.

The previous prime is 544979. The next prime is 545023. The reversal of 545021 is 120545.

545021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120545 = 5 ⋅24109.

It is a cyclic number.

It is not a de Polignac number, because 545021 - 2¹⁰ = 543997 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 (545023) 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, 3371 + ... + 3528.

It is an arithmetic number, because the mean of its divisors is an integer number (138000).

2⁵⁴⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

545021 is a deficient number, since it is larger than the sum of its proper divisors (6979).

545021 is an equidigital number, since it uses as much as digits as its factorization.

545021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6978.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 545021 is about 738.2553758694. The cubic root of 545021 is about 81.6841408302.

Adding to 545021 its reverse (120545), we get a palindrome (665566).

The spelling of 545021 in words is "five hundred forty-five thousand, twenty-one".