686089 has 2 divisors, whose sum is σ = 686090. Its totient is φ = 686088.

The previous prime is 686087. The next prime is 686099. The reversal of 686089 is 980686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 672400 + 13689 = 820^2 + 117^2 .

It is a cyclic number.

It is not a de Polignac number, because 686089 - 2¹ = 686087 is a prime.

Together with 686087, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (686087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343044 + 343045.

It is an arithmetic number, because the mean of its divisors is an integer number (343045).

2⁶⁸⁶⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

686089 is a deficient number, since it is larger than the sum of its proper divisors (1).

686089 is an equidigital number, since it uses as much as digits as its factorization.

686089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 686089 is about 828.3048955548. The cubic root of 686089 is about 88.1982873744.

The spelling of 686089 in words is "six hundred eighty-six thousand, eighty-nine".