683500721 has 2 divisors, whose sum is σ = 683500722. Its totient is φ = 683500720.

The previous prime is 683500711. The next prime is 683500771. The reversal of 683500721 is 127005386.

It is a happy number.

683500721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668946496 + 14554225 = 25864^2 + 3815^2 .

It is a cyclic number.

It is not a de Polignac number, because 683500721 - 2¹⁰ = 683499697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (683500711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341750360 + 341750361.

It is an arithmetic number, because the mean of its divisors is an integer number (341750361).

Almost surely, 2^683500721 is an apocalyptic number.

It is an amenable number.

683500721 is a deficient number, since it is larger than the sum of its proper divisors (1).

683500721 is an equidigital number, since it uses as much as digits as its factorization.

683500721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 683500721 is about 26143.8467139019. The cubic root of 683500721 is about 880.8723791221.

The spelling of 683500721 in words is "six hundred eighty-three million, five hundred thousand, seven hundred twenty-one".