681089 has 2 divisors, whose sum is σ = 681090. Its totient is φ = 681088.

The previous prime is 681067. The next prime is 681091. The reversal of 681089 is 980186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350464 + 330625 = 592^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 681089 - 2¹² = 676993 is a prime.

Together with 681091, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681089.

It is not a weakly prime, because it can be changed into another prime (681019) 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, 340544 + 340545.

It is an arithmetic number, because the mean of its divisors is an integer number (340545).

2⁶⁸¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

681089 is a deficient number, since it is larger than the sum of its proper divisors (1).

681089 is an equidigital number, since it uses as much as digits as its factorization.

681089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 681089 is about 825.2811642101. The cubic root of 681089 is about 87.9835110290.

The spelling of 681089 in words is "six hundred eighty-one thousand, eighty-nine".