540511221 has 24 divisors (see below), whose sum is σ = 763158240. Its totient is φ = 340232544.

The previous prime is 540511217. The next prime is 540511273. The reversal of 540511221 is 122115045.

It is not a de Polignac number, because 540511221 - 2² = 540511217 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 (540511211) 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, 420646 + ... + 421928.

It is an arithmetic number, because the mean of its divisors is an integer number (31798260).

Almost surely, 2^540511221 is an apocalyptic number.

It is an amenable number.

540511221 is a deficient number, since it is larger than the sum of its proper divisors (222647019).

540511221 is a wasteful number, since it uses less digits than its factorization.

540511221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713 (or 1694 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 540511221 is about 23248.8971996523. The cubic root of 540511221 is about 814.5821793515.

Adding to 540511221 its reverse (122115045), we get a palindrome (662626266).

The spelling of 540511221 in words is "five hundred forty million, five hundred eleven thousand, two hundred twenty-one".