543540521 has 4 divisors (see below), whose sum is σ = 543599700. Its totient is φ = 543481344.

The previous prime is 543540497. The next prime is 543540551. The reversal of 543540521 is 125045345.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 148962025 + 394578496 = 12205^2 + 19864^2 .

It is a cyclic number.

It is not a de Polignac number, because 543540521 - 2¹⁰ = 543539497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (543540551) 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, 12536 + ... + 35273.

It is an arithmetic number, because the mean of its divisors is an integer number (135899925).

Almost surely, 2^543540521 is an apocalyptic number.

It is an amenable number.

543540521 is a deficient number, since it is larger than the sum of its proper divisors (59179).

543540521 is a wasteful number, since it uses less digits than its factorization.

543540521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59178.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 543540521 is about 23313.9554987994. The cubic root of 543540521 is about 816.1011229485.

Adding to 543540521 its reverse (125045345), we get a palindrome (668585866).

The spelling of 543540521 in words is "five hundred forty-three million, five hundred forty thousand, five hundred twenty-one".