686141 has 2 divisors, whose sum is σ = 686142. Its totient is φ = 686140.

The previous prime is 686131. The next prime is 686143. The reversal of 686141 is 141686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674041 + 12100 = 821^2 + 110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686141 is a prime.

Together with 686143, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686141.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686141.

It is not a weakly prime, because it can be changed into another prime (686143) 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, 343070 + 343071.

It is an arithmetic number, because the mean of its divisors is an integer number (343071).

2⁶⁸⁶¹⁴¹ is an apocalyptic number.

It is an amenable number.

686141 is a deficient number, since it is larger than the sum of its proper divisors (1).

686141 is an equidigital number, since it uses as much as digits as its factorization.

686141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 686141 is about 828.3362843676. The cubic root of 686141 is about 88.2005155572.

The spelling of 686141 in words is "six hundred eighty-six thousand, one hundred forty-one".