4459643921 has 2 divisors, whose sum is σ = 4459643922. Its totient is φ = 4459643920.

The previous prime is 4459643917. The next prime is 4459643933. The reversal of 4459643921 is 1293469544.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3029291521 + 1430352400 = 55039^2 + 37820^2 .

It is a cyclic number.

It is not a de Polignac number, because 4459643921 - 2² = 4459643917 is a prime.

It is a super-2 number, since 2×4459643921² = 39776847804224508482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4459643941) 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, 2229821960 + 2229821961.

It is an arithmetic number, because the mean of its divisors is an integer number (2229821961).

Almost surely, 2^4459643921 is an apocalyptic number.

It is an amenable number.

4459643921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4459643921 is an equidigital number, since it uses as much as digits as its factorization.

4459643921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 47.

The square root of 4459643921 is about 66780.5654438475. The cubic root of 4459643921 is about 1646.0135069884.

The spelling of 4459643921 in words is "four billion, four hundred fifty-nine million, six hundred forty-three thousand, nine hundred twenty-one".