685271 has 2 divisors, whose sum is σ = 685272. Its totient is φ = 685270.

The previous prime is 685249. The next prime is 685297. The reversal of 685271 is 172586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685271 - 2¹⁸ = 423127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342635 + 342636.

It is an arithmetic number, because the mean of its divisors is an integer number (342636).

2⁶⁸⁵²⁷¹ is an apocalyptic number.

685271 is a deficient number, since it is larger than the sum of its proper divisors (1).

685271 is an equidigital number, since it uses as much as digits as its factorization.

685271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 685271 is about 827.8109687604. The cubic root of 685271 is about 88.1632215202.

The spelling of 685271 in words is "six hundred eighty-five thousand, two hundred seventy-one".