47128321 has 2 divisors, whose sum is σ = 47128322. Its totient is φ = 47128320.

The previous prime is 47128297. The next prime is 47128349. The reversal of 47128321 is 12382174.

47128321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (47128349) can be obtained adding 47128321 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43560000 + 3568321 = 6600^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 47128321 - 2¹¹ = 47126273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47128321.

It is not a weakly prime, because it can be changed into another prime (47128351) 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, 23564160 + 23564161.

It is an arithmetic number, because the mean of its divisors is an integer number (23564161).

Almost surely, 2^47128321 is an apocalyptic number.

It is an amenable number.

47128321 is a deficient number, since it is larger than the sum of its proper divisors (1).

47128321 is an equidigital number, since it uses as much as digits as its factorization.

47128321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 47128321 is about 6865.0069919848. The cubic root of 47128321 is about 361.2107408955.

The spelling of 47128321 in words is "forty-seven million, one hundred twenty-eight thousand, three hundred twenty-one".