543521 has 4 divisors (see below), whose sum is σ = 592944. Its totient is φ = 494100.

The previous prime is 543509. The next prime is 543539. The reversal of 543521 is 125345.

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 a cyclic number.

It is not a de Polignac number, because 543521 - 2¹⁰ = 542497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 543493 and 543502.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 543521.

It is not an unprimeable number, because it can be changed into a prime (543551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24695 + ... + 24716.

It is an arithmetic number, because the mean of its divisors is an integer number (148236).

2⁵⁴³⁵²¹ is an apocalyptic number.

It is an amenable number.

543521 is a deficient number, since it is larger than the sum of its proper divisors (49423).

543521 is a wasteful number, since it uses less digits than its factorization.

543521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49422.

The product of its digits is 600, while the sum is 20.

The square root of 543521 is about 737.2387672932. The cubic root of 543521 is about 81.6091352870.

Adding to 543521 its reverse (125345), we get a palindrome (668866).

The spelling of 543521 in words is "five hundred forty-three thousand, five hundred twenty-one".