685061 has 4 divisors (see below), whose sum is σ = 737772. Its totient is φ = 632352.

The previous prime is 685057. The next prime is 685063. The reversal of 685061 is 160586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 429025 + 256036 = 655^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 685061 - 2² = 685057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685063) 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, 26336 + ... + 26361.

It is an arithmetic number, because the mean of its divisors is an integer number (184443).

2⁶⁸⁵⁰⁶¹ is an apocalyptic number.

It is an amenable number.

685061 is a deficient number, since it is larger than the sum of its proper divisors (52711).

685061 is a wasteful number, since it uses less digits than its factorization.

685061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52710.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 685061 is about 827.6841184897. The cubic root of 685061 is about 88.1542147827.

Subtracting from 685061 its sum of digits (26), we obtain a triangular number (685035 = T₁₁₇₀).

The spelling of 685061 in words is "six hundred eighty-five thousand, sixty-one".