685297 has 2 divisors, whose sum is σ = 685298. Its totient is φ = 685296.

The previous prime is 685271. The next prime is 685301. The reversal of 685297 is 792586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505521 + 179776 = 711^2 + 424^2 .

It is a cyclic number.

It is not a de Polignac number, because 685297 - 2⁷ = 685169 is a prime.

It is not a weakly prime, because it can be changed into another prime (685247) 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, 342648 + 342649.

It is an arithmetic number, because the mean of its divisors is an integer number (342649).

2⁶⁸⁵²⁹⁷ is an apocalyptic number.

It is an amenable number.

685297 is a deficient number, since it is larger than the sum of its proper divisors (1).

685297 is an equidigital number, since it uses as much as digits as its factorization.

685297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 685297 is about 827.8266726797. The cubic root of 685297 is about 88.1643365121.

The spelling of 685297 in words is "six hundred eighty-five thousand, two hundred ninety-seven".