545645 has 8 divisors (see below), whose sum is σ = 665880. Its totient is φ = 429120.

The previous prime is 545641. The next prime is 545647. The reversal of 545645 is 546545.

545645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 45796 + 499849 = 214^2 + 707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 545645 - 2² = 545641 is a prime.

It is a super-3 number, since 3×545645³ = 487362146532633375, which contains 333 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 590 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (83235).

2⁵⁴⁵⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

545645 is a deficient number, since it is larger than the sum of its proper divisors (120235).

545645 is a wasteful number, since it uses less digits than its factorization.

545645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855.

The product of its digits is 12000, while the sum is 29.

The square root of 545645 is about 738.6778729595. The cubic root of 545645 is about 81.7153026043.

Subtracting 545645 from its reverse (546545), we obtain a square (900 = 30²).

The spelling of 545645 in words is "five hundred forty-five thousand, six hundred forty-five".