685525 has 12 divisors (see below), whose sum is σ = 900612. Its totient is φ = 515840.

The previous prime is 685519. The next prime is 685537. The reversal of 685525 is 525586.

685525 = 90² + 91² + ... + 140².

It can be written as a sum of positive squares in 6 ways, for example, as 3249 + 682276 = 57^2 + 826^2 .

It is not a de Polignac number, because 685525 - 2⁵ = 685493 is a prime.

It is a Duffinian number.

685525 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 382 + ... + 1231.

It is an arithmetic number, because the mean of its divisors is an integer number (75051).

2⁶⁸⁵⁵²⁵ is an apocalyptic number.

It is an amenable number.

685525 is a deficient number, since it is larger than the sum of its proper divisors (215087).

685525 is a wasteful number, since it uses less digits than its factorization.

685525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640 (or 1635 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 685525 is about 827.9643712141. The cubic root of 685525 is about 88.1741129253.

The spelling of 685525 in words is "six hundred eighty-five thousand, five hundred twenty-five".