540921 has 4 divisors (see below), whose sum is σ = 721232. Its totient is φ = 360612.

The previous prime is 540907. The next prime is 540961. The reversal of 540921 is 129045.

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 540921 - 2¹⁰ = 539897 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90151 + ... + 90156.

It is an arithmetic number, because the mean of its divisors is an integer number (180308).

2⁵⁴⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

540921 is a deficient number, since it is larger than the sum of its proper divisors (180311).

540921 is a wasteful number, since it uses less digits than its factorization.

540921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180310.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 540921 is about 735.4733169871. The cubic root of 540921 is about 81.4787981031.

Adding to 540921 its reverse (129045), we get a palindrome (669966).

The spelling of 540921 in words is "five hundred forty thousand, nine hundred twenty-one".