545643 has 16 divisors (see below), whose sum is σ = 924160. Its totient is φ = 311688.

The previous prime is 545641. The next prime is 545647. The reversal of 545643 is 346545.

545643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 545643 - 2¹ = 545641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1255 + ... + 1632.

It is an arithmetic number, because the mean of its divisors is an integer number (57760).

2⁵⁴⁵⁶⁴³ is an apocalyptic number.

545643 is a deficient number, since it is larger than the sum of its proper divisors (378517).

545643 is a wasteful number, since it uses less digits than its factorization.

545643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903 (or 2897 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 545643 is about 738.6765191882. The cubic root of 545643 is about 81.7152027648.

The spelling of 545643 in words is "five hundred forty-five thousand, six hundred forty-three".