609685 has 4 divisors (see below), whose sum is σ = 731628. Its totient is φ = 487744.

The previous prime is 609683. The next prime is 609701. The reversal of 609685 is 586906.

609685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586906 = 2 ⋅293453.

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 463761 = 382^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 609685 - 2¹ = 609683 is a prime.

It is a Duffinian number.

609685 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 609685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60964 + ... + 60973.

It is an arithmetic number, because the mean of its divisors is an integer number (182907).

2⁶⁰⁹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

609685 is a deficient number, since it is larger than the sum of its proper divisors (121943).

609685 is a wasteful number, since it uses less digits than its factorization.

609685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121942.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 609685 is about 780.8232834643. The cubic root of 609685 is about 84.7946600559.

The spelling of 609685 in words is "six hundred nine thousand, six hundred eighty-five".