685241 has 4 divisors (see below), whose sum is σ = 708900. Its totient is φ = 661584.

The previous prime is 685231. The next prime is 685247. The reversal of 685241 is 142586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142586 = 2 ⋅71293.

It can be written as a sum of positive squares in 2 ways, for example, as 137641 + 547600 = 371^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 685241 - 2⁶ = 685177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 685241.

It is not an unprimeable number, because it can be changed into a 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 in 3 ways as a sum of consecutive naturals, for example, 11786 + ... + 11843.

It is an arithmetic number, because the mean of its divisors is an integer number (177225).

2⁶⁸⁵²⁴¹ is an apocalyptic number.

It is an amenable number.

685241 is a deficient number, since it is larger than the sum of its proper divisors (23659).

685241 is a wasteful number, since it uses less digits than its factorization.

685241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23658.

The product of its digits is 1920, while the sum is 26.

The square root of 685241 is about 827.7928484832. The cubic root of 685241 is about 88.1619349561.

The spelling of 685241 in words is "six hundred eighty-five thousand, two hundred forty-one".