4543921 has 2 divisors, whose sum is σ = 4543922. Its totient is φ = 4543920.

The previous prime is 4543901. The next prime is 4543927. The reversal of 4543921 is 1293454.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4431025 + 112896 = 2105^2 + 336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4543921 is a prime.

4543921 is a lucky number.

It is equal to p₃₁₈₇₇₂ and since 4543921 and 318772 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4543921.

It is not a weakly prime, because it can be changed into another prime (4543927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2271960 + 2271961.

It is an arithmetic number, because the mean of its divisors is an integer number (2271961).

Almost surely, 2^4543921 is an apocalyptic number.

It is an amenable number.

4543921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4543921 is an equidigital number, since it uses as much as digits as its factorization.

4543921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 4543921 is about 2131.6474849280. The cubic root of 4543921 is about 165.6317500987.

The spelling of 4543921 in words is "four million, five hundred forty-three thousand, nine hundred twenty-one".