540245561 has 4 divisors (see below), whose sum is σ = 553422324. Its totient is φ = 527068800.

The previous prime is 540245549. The next prime is 540245599. The reversal of 540245561 is 165542045.

540245561 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.

It can be written as a sum of positive squares in 2 ways, for example, as 37589161 + 502656400 = 6131^2 + 22420^2 .

It is a cyclic number.

It is not a de Polignac number, because 540245561 - 2¹⁴ = 540229177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (540245521) 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, 6588320 + ... + 6588401.

It is an arithmetic number, because the mean of its divisors is an integer number (138355581).

Almost surely, 2^540245561 is an apocalyptic number.

It is an amenable number.

540245561 is a deficient number, since it is larger than the sum of its proper divisors (13176763).

540245561 is a wasteful number, since it uses less digits than its factorization.

540245561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13176762.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 540245561 is about 23243.1831081717. The cubic root of 540245561 is about 814.4487024031.

The spelling of 540245561 in words is "five hundred forty million, two hundred forty-five thousand, five hundred sixty-one".