6327721 has 2 divisors, whose sum is σ = 6327722. Its totient is φ = 6327720.

The previous prime is 6327709. The next prime is 6327743. The reversal of 6327721 is 1277236.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3956121 + 2371600 = 1989^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 6327721 - 2⁷ = 6327593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6327721.

It is not a weakly prime, because it can be changed into another prime (6327781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3163860 + 3163861.

It is an arithmetic number, because the mean of its divisors is an integer number (3163861).

Almost surely, 2^6327721 is an apocalyptic number.

It is an amenable number.

6327721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6327721 is an equidigital number, since it uses as much as digits as its factorization.

6327721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 28.

The square root of 6327721 is about 2515.4961737200. The cubic root of 6327721 is about 184.9619692948.

The spelling of 6327721 in words is "six million, three hundred twenty-seven thousand, seven hundred twenty-one".