331216 has 20 divisors (see below), whose sum is σ = 650752. Its totient is φ = 163296.

The previous prime is 331213. The next prime is 331217. The reversal of 331216 is 612133.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a self number, because there is not a number n which added to its sum of digits gives 331216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331213) 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, 1951 + ... + 2113.

2³³¹²¹⁶ is an apocalyptic number.

It is an amenable number.

331216 is a deficient number, since it is larger than the sum of its proper divisors (319536).

331216 is a wasteful number, since it uses less digits than its factorization.

331216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 292 counting only the distinct ones).

The product of its digits is 108, while the sum is 16.

The square root of 331216 is about 575.5136835906. The cubic root of 331216 is about 69.1890077988.

Adding to 331216 its reverse (612133), we get a palindrome (943349).

The spelling of 331216 in words is "three hundred thirty-one thousand, two hundred sixteen".