683680981 has 2 divisors, whose sum is σ = 683680982. Its totient is φ = 683680980.

The previous prime is 683680969. The next prime is 683681021. The reversal of 683680981 is 189086386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679644900 + 4036081 = 26070^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 683680981 - 2⁷ = 683680853 is a prime.

It is a super-2 number, since 2×683680981² = 934839367562244722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (683680961) 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, 341840490 + 341840491.

It is an arithmetic number, because the mean of its divisors is an integer number (341840491).

Almost surely, 2^683680981 is an apocalyptic number.

It is an amenable number.

683680981 is a deficient number, since it is larger than the sum of its proper divisors (1).

683680981 is an equidigital number, since it uses as much as digits as its factorization.

683680981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 683680981 is about 26147.2939517649. The cubic root of 683680981 is about 880.9498099588.

The spelling of 683680981 in words is "six hundred eighty-three million, six hundred eighty thousand, nine hundred eighty-one".