543621 has 16 divisors (see below), whose sum is σ = 798336. Its totient is φ = 326976.

The previous prime is 543617. The next prime is 543637. The reversal of 543621 is 126345.

It is a happy number.

It is not a de Polignac number, because 543621 - 2² = 543617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1936 + ... + 2198.

It is an arithmetic number, because the mean of its divisors is an integer number (49896).

2⁵⁴³⁶²¹ is an apocalyptic number.

It is an amenable number.

543621 is a deficient number, since it is larger than the sum of its proper divisors (254715).

543621 is a wasteful number, since it uses less digits than its factorization.

543621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332.

The product of its digits is 720, while the sum is 21.

The square root of 543621 is about 737.3065848072. The cubic root of 543621 is about 81.6141399468.

Adding to 543621 its reverse (126345), we get a palindrome (669966).

The spelling of 543621 in words is "five hundred forty-three thousand, six hundred twenty-one".