331685 has 4 divisors (see below), whose sum is σ = 398028. Its totient is φ = 265344.

The previous prime is 331663. The next prime is 331691. The reversal of 331685 is 586133.

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 145924 + 185761 = 382^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 331685 - 2¹⁰ = 330661 is a prime.

It is a super-2 number, since 2×331685² = 220029878450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 4.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331685.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33164 + ... + 33173.

It is an arithmetic number, because the mean of its divisors is an integer number (99507).

2³³¹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

331685 is a deficient number, since it is larger than the sum of its proper divisors (66343).

331685 is an equidigital number, since it uses as much as digits as its factorization.

331685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66342.

The product of its digits is 2160, while the sum is 26.

The square root of 331685 is about 575.9210015271. The cubic root of 331685 is about 69.2216494793.

The spelling of 331685 in words is "three hundred thirty-one thousand, six hundred eighty-five".