331605 has 12 divisors (see below), whose sum is σ = 574860. Its totient is φ = 176832.

The previous prime is 331603. The next prime is 331609. The reversal of 331605 is 506133.

It can be written as a sum of positive squares in 2 ways, for example, as 224676 + 106929 = 474^2 + 327^2 .

It is not a de Polignac number, because 331605 - 2¹ = 331603 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3640 + ... + 3729.

It is an arithmetic number, because the mean of its divisors is an integer number (47905).

2³³¹⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

331605 is a deficient number, since it is larger than the sum of its proper divisors (243255).

331605 is a wasteful number, since it uses less digits than its factorization.

331605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380 (or 7377 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 331605 is about 575.8515433686. The cubic root of 331605 is about 69.2160837797.

Adding to 331605 its reverse (506133), we get a palindrome (837738).

The spelling of 331605 in words is "three hundred thirty-one thousand, six hundred five".