685231 has 2 divisors, whose sum is σ = 685232. Its totient is φ = 685230.

The previous prime is 685199. The next prime is 685247. The reversal of 685231 is 132586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685231 - 2⁵ = 685199 is a prime.

It is a super-2 number, since 2×685231² = 939083046722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 685196 and 685205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342615 + 342616.

It is an arithmetic number, because the mean of its divisors is an integer number (342616).

2⁶⁸⁵²³¹ is an apocalyptic number.

685231 is a deficient number, since it is larger than the sum of its proper divisors (1).

685231 is an equidigital number, since it uses as much as digits as its factorization.

685231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 685231 is about 827.7868083027. The cubic root of 685231 is about 88.1615060930.

The spelling of 685231 in words is "six hundred eighty-five thousand, two hundred thirty-one".