545691 has 8 divisors (see below), whose sum is σ = 740160. Its totient is φ = 357512.

The previous prime is 545663. The next prime is 545711. The reversal of 545691 is 196545.

545691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 545691 - 2¹⁰ = 544667 is a prime.

545691 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 545691.

It is not an unprimeable number, because it can be changed into a prime (545621) 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, 1365 + ... + 1718.

It is an arithmetic number, because the mean of its divisors is an integer number (92520).

2⁵⁴⁵⁶⁹¹ is an apocalyptic number.

545691 is a deficient number, since it is larger than the sum of its proper divisors (194469).

545691 is a wasteful number, since it uses less digits than its factorization.

545691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145.

The product of its digits is 5400, while the sum is 30.

The square root of 545691 is about 738.7090090151. The cubic root of 545691 is about 81.7175988459.

The spelling of 545691 in words is "five hundred forty-five thousand, six hundred ninety-one".