685249 has 2 divisors, whose sum is σ = 685250. Its totient is φ = 685248.

The previous prime is 685247. The next prime is 685271. The reversal of 685249 is 942586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680625 + 4624 = 825^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 685249 - 2¹ = 685247 is a prime.

Together with 685247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (685247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342624 + 342625.

It is an arithmetic number, because the mean of its divisors is an integer number (342625).

2⁶⁸⁵²⁴⁹ is an apocalyptic number.

It is an amenable number.

685249 is a deficient number, since it is larger than the sum of its proper divisors (1).

685249 is an equidigital number, since it uses as much as digits as its factorization.

685249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 685249 is about 827.7976805959. The cubic root of 685249 is about 88.1622780435.

The spelling of 685249 in words is "six hundred eighty-five thousand, two hundred forty-nine".