540581 has 4 divisors (see below), whose sum is σ = 546252. Its totient is φ = 534912.

The previous prime is 540577. The next prime is 540587. The reversal of 540581 is 185045.

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 111556 + 429025 = 334^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 540581 - 2² = 540577 is a prime.

It is a super-2 number, since 2×540581² = 584455635122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2690 + ... + 2883.

It is an arithmetic number, because the mean of its divisors is an integer number (136563).

2⁵⁴⁰⁵⁸¹ is an apocalyptic number.

It is an amenable number.

540581 is a deficient number, since it is larger than the sum of its proper divisors (5671).

540581 is an equidigital number, since it uses as much as digits as its factorization.

540581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5670.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 540581 is about 735.2421369862. The cubic root of 540581 is about 81.4617231528.

The spelling of 540581 in words is "five hundred forty thousand, five hundred eighty-one".