540756809 has 2 divisors, whose sum is σ = 540756810. Its totient is φ = 540756808.

The previous prime is 540756793. The next prime is 540756833. The reversal of 540756809 is 908657045.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477204025 + 63552784 = 21845^2 + 7972^2 .

It is a cyclic number.

It is not a de Polignac number, because 540756809 - 2⁴ = 540756793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 540756809.

It is not a weakly prime, because it can be changed into another prime (540756109) 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 as a sum of consecutive naturals, namely, 270378404 + 270378405.

It is an arithmetic number, because the mean of its divisors is an integer number (270378405).

Almost surely, 2^540756809 is an apocalyptic number.

It is an amenable number.

540756809 is a deficient number, since it is larger than the sum of its proper divisors (1).

540756809 is an equidigital number, since it uses as much as digits as its factorization.

540756809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 540756809 is about 23254.1783127248. The cubic root of 540756809 is about 814.7055325213.

The spelling of 540756809 in words is "five hundred forty million, seven hundred fifty-six thousand, eight hundred nine".