545581 has 8 divisors (see below), whose sum is σ = 587520. Its totient is φ = 504768.

The previous prime is 545579. The next prime is 545599. The reversal of 545581 is 185545.

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 545581 - 2¹ = 545579 is a prime.

It is a super-2 number, since 2×545581² = 595317255122, which contains 22 as substring.

545581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545521) 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, 900 + ... + 1378.

It is an arithmetic number, because the mean of its divisors is an integer number (73440).

2⁵⁴⁵⁵⁸¹ is an apocalyptic number.

It is an amenable number.

545581 is a deficient number, since it is larger than the sum of its proper divisors (41939).

545581 is a wasteful number, since it uses less digits than its factorization.

545581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563.

The product of its digits is 4000, while the sum is 28.

The square root of 545581 is about 738.6345510467. The cubic root of 545581 is about 81.7121076186.

The spelling of 545581 in words is "five hundred forty-five thousand, five hundred eighty-one".