680081 has 2 divisors, whose sum is σ = 680082. Its totient is φ = 680080.

The previous prime is 680077. The next prime is 680083. The reversal of 680081 is 180086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654481 + 25600 = 809^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 680081 - 2² = 680077 is a prime.

It is a super-2 number, since 2×680081² = 925020333122, which contains 22 as substring.

Together with 680083, 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 (680083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340040 + 340041.

It is an arithmetic number, because the mean of its divisors is an integer number (340041).

2⁶⁸⁰⁰⁸¹ is an apocalyptic number.

It is an amenable number.

680081 is a deficient number, since it is larger than the sum of its proper divisors (1).

680081 is an equidigital number, since it uses as much as digits as its factorization.

680081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 680081 is about 824.6702371251. The cubic root of 680081 is about 87.9400849046.

The spelling of 680081 in words is "six hundred eighty thousand, eighty-one".