543105421 has 4 divisors (see below), whose sum is σ = 543165244. Its totient is φ = 543045600.

The previous prime is 543105383. The next prime is 543105439. The reversal of 543105421 is 124501345.

It is a happy number.

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 68475625 + 474629796 = 8275^2 + 21786^2 .

It is a cyclic number.

It is not a de Polignac number, because 543105421 - 2¹⁷ = 542974349 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 (543105221) 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, 13170 + ... + 35491.

It is an arithmetic number, because the mean of its divisors is an integer number (135791311).

Almost surely, 2^543105421 is an apocalyptic number.

It is an amenable number.

543105421 is a deficient number, since it is larger than the sum of its proper divisors (59823).

543105421 is a wasteful number, since it uses less digits than its factorization.

543105421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59822.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 543105421 is about 23304.6223097479. The cubic root of 543105421 is about 815.8833039300.

Adding to 543105421 its reverse (124501345), we get a palindrome (667606766).

The spelling of 543105421 in words is "five hundred forty-three million, one hundred five thousand, four hundred twenty-one".