685523 has 4 divisors (see below), whose sum is σ = 690888. Its totient is φ = 680160.

The previous prime is 685519. The next prime is 685537. The reversal of 685523 is 325586.

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

It is a cyclic number.

It is not a de Polignac number, because 685523 - 2² = 685519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685513) 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, 2486 + ... + 2747.

It is an arithmetic number, because the mean of its divisors is an integer number (172722).

2⁶⁸⁵⁵²³ is an apocalyptic number.

685523 is a deficient number, since it is larger than the sum of its proper divisors (5365).

685523 is a wasteful number, since it uses less digits than its factorization.

685523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5364.

The product of its digits is 7200, while the sum is 29.

The square root of 685523 is about 827.9631634318. The cubic root of 685523 is about 88.1740271767.

The spelling of 685523 in words is "six hundred eighty-five thousand, five hundred twenty-three".