540544221 has 24 divisors (see below), whose sum is σ = 893110400. Its totient is φ = 308611296.

The previous prime is 540544219. The next prime is 540544247. The reversal of 540544221 is 122445045.

It is not a de Polignac number, because 540544221 - 2¹ = 540544219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540544261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85071 + ... + 91203.

Almost surely, 2^540544221 is an apocalyptic number.

It is an amenable number.

540544221 is a deficient number, since it is larger than the sum of its proper divisors (352566179).

540544221 is a wasteful number, since it uses less digits than its factorization.

540544221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7545 (or 7542 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 540544221 is about 23249.6068999026. The cubic root of 540544221 is about 814.5987566607.

Adding to 540544221 its reverse (122445045), we get a palindrome (662989266).

The spelling of 540544221 in words is "five hundred forty million, five hundred forty-four thousand, two hundred twenty-one".