4547128321 has 4 divisors (see below), whose sum is σ = 4547503444. Its totient is φ = 4546753200.

The previous prime is 4547128301. The next prime is 4547128349. The reversal of 4547128321 is 1238217454.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1592010000 + 2955118321 = 39900^2 + 54361^2 .

It is a cyclic number.

It is not a de Polignac number, because 4547128321 - 2¹⁹ = 4546604033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4547128301) 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, 168750 + ... + 193831.

It is an arithmetic number, because the mean of its divisors is an integer number (1136875861).

Almost surely, 2^4547128321 is an apocalyptic number.

It is an amenable number.

4547128321 is a deficient number, since it is larger than the sum of its proper divisors (375123).

4547128321 is a wasteful number, since it uses less digits than its factorization.

4547128321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375122.

The product of its digits is 53760, while the sum is 37.

The square root of 4547128321 is about 67432.3981554861. The cubic root of 4547128321 is about 1656.7071125500.

The spelling of 4547128321 in words is "four billion, five hundred forty-seven million, one hundred twenty-eight thousand, three hundred twenty-one".