685311 has 16 divisors (see below), whose sum is σ = 1050240. Its totient is φ = 393120.

The previous prime is 685301. The next prime is 685319. The reversal of 685311 is 113586.

It is not a de Polignac number, because 685311 - 2⁶ = 685247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (65640).

2⁶⁸⁵³¹¹ is an apocalyptic number.

685311 is a deficient number, since it is larger than the sum of its proper divisors (364929).

685311 is a wasteful number, since it uses less digits than its factorization.

685311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126.

The product of its digits is 720, while the sum is 24.

The square root of 685311 is about 827.8351285129. The cubic root of 685311 is about 88.1649368806.

Adding to 685311 its reverse (113586), we get a palindrome (798897).

The spelling of 685311 in words is "six hundred eighty-five thousand, three hundred eleven".