685522 has 4 divisors (see below), whose sum is σ = 1028286. Its totient is φ = 342760.

The previous prime is 685519. The next prime is 685537. The reversal of 685522 is 225586.

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

It can be written as a sum of positive squares in only one way, i.e., 622521 + 63001 = 789^2 + 251^2 .

It is a d-powerful number, because it can be written as 6⁷ + 8⁴ + 5⁴ + 5⁸ + 2¹¹ + 2¹³ .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 171379 + ... + 171382.

2⁶⁸⁵⁵²² is an apocalyptic number.

685522 is a deficient number, since it is larger than the sum of its proper divisors (342764).

685522 is a wasteful number, since it uses less digits than its factorization.

685522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342763.

The product of its digits is 4800, while the sum is 28.

The square root of 685522 is about 827.9625595400. The cubic root of 685522 is about 88.1739843023.

The spelling of 685522 in words is "six hundred eighty-five thousand, five hundred twenty-two".