685361 has 2 divisors, whose sum is σ = 685362. Its totient is φ = 685360.

The previous prime is 685339. The next prime is 685367. The reversal of 685361 is 163586.

685361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 430336 + 255025 = 656^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 685361 - 2⁶ = 685297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685361.

It is not a weakly prime, because it can be changed into another prime (685367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342680 + 342681.

It is an arithmetic number, because the mean of its divisors is an integer number (342681).

2⁶⁸⁵³⁶¹ is an apocalyptic number.

It is an amenable number.

685361 is a deficient number, since it is larger than the sum of its proper divisors (1).

685361 is an equidigital number, since it uses as much as digits as its factorization.

685361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 685361 is about 827.8653272121. The cubic root of 685361 is about 88.1670809873.

The spelling of 685361 in words is "six hundred eighty-five thousand, three hundred sixty-one".