4543421 has 2 divisors, whose sum is σ = 4543422. Its totient is φ = 4543420.

The previous prime is 4543417. The next prime is 4543477. The reversal of 4543421 is 1243454.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2544025 + 1999396 = 1595^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 4543421 - 2² = 4543417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4543481) 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 as a sum of consecutive naturals, namely, 2271710 + 2271711.

It is an arithmetic number, because the mean of its divisors is an integer number (2271711).

Almost surely, 2^4543421 is an apocalyptic number.

It is an amenable number.

4543421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4543421 is an equidigital number, since it uses as much as digits as its factorization.

4543421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 23.

The square root of 4543421 is about 2131.5302015219. The cubic root of 4543421 is about 165.6256746620.

Adding to 4543421 its reverse (1243454), we get a palindrome (5786875).

The spelling of 4543421 in words is "four million, five hundred forty-three thousand, four hundred twenty-one".