531685 has 16 divisors (see below), whose sum is σ = 796032. Its totient is φ = 331200.

The previous prime is 531673. The next prime is 531689. The reversal of 531685 is 586135.

It is not a de Polignac number, because 531685 - 2⁹ = 531173 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306 + ... + 1075.

It is an arithmetic number, because the mean of its divisors is an integer number (49752).

2⁵³¹⁶⁸⁵ is an apocalyptic number.

531685 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

531685 is a deficient number, since it is larger than the sum of its proper divisors (264347).

531685 is a wasteful number, since it uses less digits than its factorization.

531685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404.

The product of its digits is 3600, while the sum is 28.

The square root of 531685 is about 729.1673333330. The cubic root of 531685 is about 81.0123945876.

The spelling of 531685 in words is "five hundred thirty-one thousand, six hundred eighty-five".