545845 has 4 divisors (see below), whose sum is σ = 655020. Its totient is φ = 436672.

The previous prime is 545843. The next prime is 545863. The reversal of 545845 is 548545.

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 106276 + 439569 = 326^2 + 663^2 .

It is a cyclic number.

It is not a de Polignac number, because 545845 - 2¹ = 545843 is a prime.

It is a Smith number, since the sum of its digits (31) 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 (545843) 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, 54580 + ... + 54589.

It is an arithmetic number, because the mean of its divisors is an integer number (163755).

2⁵⁴⁵⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

545845 is a deficient number, since it is larger than the sum of its proper divisors (109175).

545845 is a wasteful number, since it uses less digits than its factorization.

545845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109174.

The product of its digits is 16000, while the sum is 31.

The square root of 545845 is about 738.8132375641. The cubic root of 545845 is about 81.7252853245.

The spelling of 545845 in words is "five hundred forty-five thousand, eight hundred forty-five".