6345721 has 2 divisors, whose sum is σ = 6345722. Its totient is φ = 6345720.

The previous prime is 6345701. The next prime is 6345737. The reversal of 6345721 is 1275436.

6345721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4818025 + 1527696 = 2195^2 + 1236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6345721 is a prime.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 6345721.

It is not a weakly prime, because it can be changed into another prime (6345701) 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, 3172860 + 3172861.

It is an arithmetic number, because the mean of its divisors is an integer number (3172861).

Almost surely, 2^6345721 is an apocalyptic number.

It is an amenable number.

6345721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6345721 is an equidigital number, since it uses as much as digits as its factorization.

6345721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 28.

The square root of 6345721 is about 2519.0714559139. The cubic root of 6345721 is about 185.1371858033.

The spelling of 6345721 in words is "six million, three hundred forty-five thousand, seven hundred twenty-one".