6733721 has 2 divisors, whose sum is σ = 6733722. Its totient is φ = 6733720.

The previous prime is 6733709. The next prime is 6733747. The reversal of 6733721 is 1273376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4044121 + 2689600 = 2011^2 + 1640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6733721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6733121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3366860 + 3366861.

It is an arithmetic number, because the mean of its divisors is an integer number (3366861).

Almost surely, 2^6733721 is an apocalyptic number.

It is an amenable number.

6733721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6733721 is an equidigital number, since it uses as much as digits as its factorization.

6733721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 29.

The square root of 6733721 is about 2594.9414251578. The cubic root of 6733721 is about 188.8361073722.

The spelling of 6733721 in words is "six million, seven hundred thirty-three thousand, seven hundred twenty-one".