686201 has 2 divisors, whose sum is σ = 686202. Its totient is φ = 686200.

The previous prime is 686197. The next prime is 686209. The reversal of 686201 is 102686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678976 + 7225 = 824^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 686201 - 2² = 686197 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686201.

It is not a weakly prime, because it can be changed into another prime (686209) 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, 343100 + 343101.

It is an arithmetic number, because the mean of its divisors is an integer number (343101).

2⁶⁸⁶²⁰¹ is an apocalyptic number.

It is an amenable number.

686201 is a deficient number, since it is larger than the sum of its proper divisors (1).

686201 is an equidigital number, since it uses as much as digits as its factorization.

686201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 686201 is about 828.3725007507. The cubic root of 686201 is about 88.2030863974.

Adding to 686201 its reverse (102686), we get a palindrome (788887).

The spelling of 686201 in words is "six hundred eighty-six thousand, two hundred one".