540545021 has 2 divisors, whose sum is σ = 540545022. Its totient is φ = 540545020.

The previous prime is 540544987. The next prime is 540545059. The reversal of 540545021 is 120545045.

540545021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 466344025 + 74200996 = 21595^2 + 8614^2 .

It is a cyclic number.

It is not a de Polignac number, because 540545021 - 2⁶ = 540544957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (540545221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270272510 + 270272511.

It is an arithmetic number, because the mean of its divisors is an integer number (270272511).

Almost surely, 2^540545021 is an apocalyptic number.

It is an amenable number.

540545021 is a deficient number, since it is larger than the sum of its proper divisors (1).

540545021 is an equidigital number, since it uses as much as digits as its factorization.

540545021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 540545021 is about 23249.6241044882. The cubic root of 540545021 is about 814.5991585265.

The spelling of 540545021 in words is "five hundred forty million, five hundred forty-five thousand, twenty-one".