683250721 has 2 divisors, whose sum is σ = 683250722. Its totient is φ = 683250720.

The previous prime is 683250707. The next prime is 683250749. The reversal of 683250721 is 127052386.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599711121 + 83539600 = 24489^2 + 9140^2 .

It is a cyclic number.

It is not a de Polignac number, because 683250721 - 2¹¹ = 683248673 is a prime.

It is not a weakly prime, because it can be changed into another prime (683250761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341625360 + 341625361.

It is an arithmetic number, because the mean of its divisors is an integer number (341625361).

Almost surely, 2^683250721 is an apocalyptic number.

It is an amenable number.

683250721 is a deficient number, since it is larger than the sum of its proper divisors (1).

683250721 is an equidigital number, since it uses as much as digits as its factorization.

683250721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 683250721 is about 26139.0650368371. The cubic root of 683250721 is about 880.7649688723.

The spelling of 683250721 in words is "six hundred eighty-three million, two hundred fifty thousand, seven hundred twenty-one".