540605561 has 4 divisors (see below), whose sum is σ = 542516112. Its totient is φ = 538695012.

The previous prime is 540605521. The next prime is 540605563. The reversal of 540605561 is 165506045.

540605561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 540605561 - 2¹⁴ = 540589177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540605563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954851 + ... + 955416.

It is an arithmetic number, because the mean of its divisors is an integer number (135629028).

Almost surely, 2^540605561 is an apocalyptic number.

It is an amenable number.

540605561 is a deficient number, since it is larger than the sum of its proper divisors (1910551).

540605561 is a wasteful number, since it uses less digits than its factorization.

540605561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910550.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 540605561 is about 23250.9260245694. The cubic root of 540605561 is about 814.6295685695.

The spelling of 540605561 in words is "five hundred forty million, six hundred five thousand, five hundred sixty-one".