545811 has 24 divisors (see below), whose sum is σ = 875520. Its totient is φ = 301392.

The previous prime is 545791. The next prime is 545827. The reversal of 545811 is 118545.

It is not a de Polignac number, because 545811 - 2⁶ = 545747 is a prime.

It is a nialpdrome in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 545811.

It is not an unprimeable number, because it can be changed into a prime (545711) 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 23 ways as a sum of consecutive naturals, for example, 6870 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (36480).

2⁵⁴⁵⁸¹¹ is an apocalyptic number.

545811 is a deficient number, since it is larger than the sum of its proper divisors (329709).

545811 is a wasteful number, since it uses less digits than its factorization.

545811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 136 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 545811 is about 738.7902273311. The cubic root of 545811 is about 81.7235884342.

The spelling of 545811 in words is "five hundred forty-five thousand, eight hundred eleven".