686611 has 2 divisors, whose sum is σ = 686612. Its totient is φ = 686610.

The previous prime is 686593. The next prime is 686639. The reversal of 686611 is 116686.

686611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (686639) can be obtained adding 686611 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686611 - 2⁹ = 686099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686611.

It is not a weakly prime, because it can be changed into another prime (686671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343305 + 343306.

It is an arithmetic number, because the mean of its divisors is an integer number (343306).

2⁶⁸⁶⁶¹¹ is an apocalyptic number.

686611 is a deficient number, since it is larger than the sum of its proper divisors (1).

686611 is an equidigital number, since it uses as much as digits as its factorization.

686611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 686611 is about 828.6199370037. The cubic root of 686611 is about 88.2206497962.

The spelling of 686611 in words is "six hundred eighty-six thousand, six hundred eleven".