4818721 has 2 divisors, whose sum is σ = 4818722. Its totient is φ = 4818720.

The previous prime is 4818719. The next prime is 4818743. The reversal of 4818721 is 1278184.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4579600 + 239121 = 2140^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 4818721 - 2¹ = 4818719 is a prime.

Together with 4818719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4818791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2409360 + 2409361.

It is an arithmetic number, because the mean of its divisors is an integer number (2409361).

Almost surely, 2^4818721 is an apocalyptic number.

It is an amenable number.

4818721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4818721 is an equidigital number, since it uses as much as digits as its factorization.

4818721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 31.

The square root of 4818721 is about 2195.1585364160. The cubic root of 4818721 is about 168.9055527731.

It can be divided in two parts, 48 and 18721, that added together give a square (18769 = 137²).

The spelling of 4818721 in words is "four million, eight hundred eighteen thousand, seven hundred twenty-one".