540661 has 8 divisors (see below), whose sum is σ = 615744. Its totient is φ = 469920.

The previous prime is 540629. The next prime is 540677. The reversal of 540661 is 166045.

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

It is not a de Polignac number, because 540661 - 2⁵ = 540629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (76968).

2⁵⁴⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

540661 is a deficient number, since it is larger than the sum of its proper divisors (75083).

540661 is a wasteful number, since it uses less digits than its factorization.

540661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 540661 is about 735.2965388195. The cubic root of 540661 is about 81.4657414321.

The spelling of 540661 in words is "five hundred forty thousand, six hundred sixty-one".