686041 has 2 divisors, whose sum is σ = 686042. Its totient is φ = 686040.

The previous prime is 686039. The next prime is 686051. The reversal of 686041 is 140686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360000 + 326041 = 600^2 + 571^2 .

It is a cyclic number.

It is not a de Polignac number, because 686041 - 2¹ = 686039 is a prime.

Together with 686039, it forms a pair of twin primes.

686041 is a lucky number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 685997 and 686015.

It is not a weakly prime, because it can be changed into another prime (686011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343020 + 343021.

It is an arithmetic number, because the mean of its divisors is an integer number (343021).

2⁶⁸⁶⁰⁴¹ is an apocalyptic number.

It is an amenable number.

686041 is a deficient number, since it is larger than the sum of its proper divisors (1).

686041 is an equidigital number, since it uses as much as digits as its factorization.

686041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 686041 is about 828.2759202102. The cubic root of 686041 is about 88.1962304904.

The spelling of 686041 in words is "six hundred eighty-six thousand, forty-one".