545545 has 32 divisors (see below), whose sum is σ = 887040. Its totient is φ = 311040.

The previous prime is 545543. The next prime is 545549.

545545 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 545545 - 2¹ = 545543 is a prime.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545543) 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 31 ways as a sum of consecutive naturals, for example, 4951 + ... + 5059.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2⁵⁴⁵⁵⁴⁵ is an apocalyptic number.

545545 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

545545 is a deficient number, since it is larger than the sum of its proper divisors (341495).

545545 is a wasteful number, since it uses less digits than its factorization.

545545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145.

The product of its digits is 10000, while the sum is 28.

The square root of 545545 is about 738.6101813541. The cubic root of 545545 is about 81.7103103294.

The spelling of 545545 in words is "five hundred forty-five thousand, five hundred forty-five".