540323621 has 4 divisors (see below), whose sum is σ = 558955500. Its totient is φ = 521691744.

The previous prime is 540323611. The next prime is 540323627. The reversal of 540323621 is 126323045.

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 402002500 + 138321121 = 20050^2 + 11761^2 .

It is a cyclic number.

It is not a de Polignac number, because 540323621 - 2¹⁰ = 540322597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540323627) 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, 9315896 + ... + 9315953.

It is an arithmetic number, because the mean of its divisors is an integer number (139738875).

Almost surely, 2^540323621 is an apocalyptic number.

It is an amenable number.

540323621 is a deficient number, since it is larger than the sum of its proper divisors (18631879).

540323621 is a wasteful number, since it uses less digits than its factorization.

540323621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18631878.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 540323621 is about 23244.8622495381. The cubic root of 540323621 is about 814.4879270375.

Adding to 540323621 its reverse (126323045), we get a palindrome (666646666).

The spelling of 540323621 in words is "five hundred forty million, three hundred twenty-three thousand, six hundred twenty-one".