540021241 has 2 divisors, whose sum is σ = 540021242. Its totient is φ = 540021240.

The previous prime is 540021239. The next prime is 540021259. The reversal of 540021241 is 142120045.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306390016 + 233631225 = 17504^2 + 15285^2 .

It is a cyclic number.

It is not a de Polignac number, because 540021241 - 2¹ = 540021239 is a prime.

Together with 540021239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (540021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270010620 + 270010621.

It is an arithmetic number, because the mean of its divisors is an integer number (270010621).

Almost surely, 2^540021241 is an apocalyptic number.

It is an amenable number.

540021241 is a deficient number, since it is larger than the sum of its proper divisors (1).

540021241 is an equidigital number, since it uses as much as digits as its factorization.

540021241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 540021241 is about 23238.3571063016. The cubic root of 540021241 is about 814.3359620504.

Adding to 540021241 its reverse (142120045), we get a palindrome (682141286).

The spelling of 540021241 in words is "five hundred forty million, twenty-one thousand, two hundred forty-one".