540512321 has 4 divisors (see below), whose sum is σ = 540672132. Its totient is φ = 540352512.

The previous prime is 540512293. The next prime is 540512327. The reversal of 540512321 is 123215045.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4080400 + 536431921 = 2020^2 + 23161^2 .

It is a cyclic number.

It is not a de Polignac number, because 540512321 - 2⁶ = 540512257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540512327) 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, 74720 + ... + 81633.

It is an arithmetic number, because the mean of its divisors is an integer number (135168033).

Almost surely, 2^540512321 is an apocalyptic number.

It is an amenable number.

540512321 is a deficient number, since it is larger than the sum of its proper divisors (159811).

540512321 is a wasteful number, since it uses less digits than its factorization.

540512321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159810.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 540512321 is about 23248.9208566763. The cubic root of 540512321 is about 814.5827319394.

Adding to 540512321 its reverse (123215045), we get a palindrome (663727366).

The spelling of 540512321 in words is "five hundred forty million, five hundred twelve thousand, three hundred twenty-one".