540810721 has 4 divisors (see below), whose sum is σ = 589975344. Its totient is φ = 491646100.

The previous prime is 540810701. The next prime is 540810761. The reversal of 540810721 is 127018045.

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 not a de Polignac number, because 540810721 - 2⁹ = 540810209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 540810721.

It is not an unprimeable number, because it can be changed into a prime (540810701) 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 in 3 ways as a sum of consecutive naturals, for example, 24582295 + ... + 24582316.

It is an arithmetic number, because the mean of its divisors is an integer number (147493836).

Almost surely, 2^540810721 is an apocalyptic number.

It is an amenable number.

540810721 is a deficient number, since it is larger than the sum of its proper divisors (49164623).

540810721 is a wasteful number, since it uses less digits than its factorization.

540810721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49164622.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 540810721 is about 23255.3374733630. The cubic root of 540810721 is about 814.7326062720.

Adding to 540810721 its reverse (127018045), we get a palindrome (667828766).

It can be divided in two parts, 5408 and 10721, that added together give a square (16129 = 127²).

The spelling of 540810721 in words is "five hundred forty million, eight hundred ten thousand, seven hundred twenty-one".