683848721 has 2 divisors, whose sum is σ = 683848722. Its totient is φ = 683848720.

The previous prime is 683848657. The next prime is 683848723. The reversal of 683848721 is 127848386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351187600 + 332661121 = 18740^2 + 18239^2 .

It is a cyclic number.

It is not a de Polignac number, because 683848721 - 2⁶ = 683848657 is a prime.

Together with 683848723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (683848723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341924360 + 341924361.

It is an arithmetic number, because the mean of its divisors is an integer number (341924361).

Almost surely, 2^683848721 is an apocalyptic number.

It is an amenable number.

683848721 is a deficient number, since it is larger than the sum of its proper divisors (1).

683848721 is an equidigital number, since it uses as much as digits as its factorization.

683848721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 47.

The square root of 683848721 is about 26150.5013527466. The cubic root of 683848721 is about 881.0218505946.

The spelling of 683848721 in words is "six hundred eighty-three million, eight hundred forty-eight thousand, seven hundred twenty-one".