4543445521 has 2 divisors, whose sum is σ = 4543445522. Its totient is φ = 4543445520.

The previous prime is 4543445519. The next prime is 4543445539. The reversal of 4543445521 is 1255443454.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3991712400 + 551733121 = 63180^2 + 23489^2 .

It is a cyclic number.

It is not a de Polignac number, because 4543445521 - 2¹ = 4543445519 is a prime.

It is a super-2 number, since 2×4543445521² = 41285794404589922882, which contains 22 as substring.

Together with 4543445519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4543445581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2271722760 + 2271722761.

It is an arithmetic number, because the mean of its divisors is an integer number (2271722761).

Almost surely, 2^4543445521 is an apocalyptic number.

It is an amenable number.

4543445521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4543445521 is an equidigital number, since it uses as much as digits as its factorization.

4543445521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192000, while the sum is 37.

The square root of 4543445521 is about 67405.0852755191. The cubic root of 4543445521 is about 1656.2597262398.

Adding to 4543445521 its reverse (1255443454), we get a palindrome (5798888975).

The spelling of 4543445521 in words is "four billion, five hundred forty-three million, four hundred forty-five thousand, five hundred twenty-one".