231216 has 20 divisors (see below), whose sum is σ = 597432. Its totient is φ = 77056.

The previous prime is 231197. The next prime is 231223. The reversal of 231216 is 612132.

231216 = 69² + 70² + ... + 100².

231216 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 231195 and 231204.

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, 2361 + ... + 2456.

2²³¹²¹⁶ is an apocalyptic number.

It is an amenable number.

231216 is an abundant number, since it is smaller than the sum of its proper divisors (366216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231216 is a wasteful number, since it uses less digits than its factorization.

231216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4828 (or 4822 counting only the distinct ones).

The product of its digits is 72, while the sum is 15.

The square root of 231216 is about 480.8492487256. The cubic root of 231216 is about 61.3770429867.

Adding to 231216 its reverse (612132), we get a palindrome (843348).

The spelling of 231216 in words is "two hundred thirty-one thousand, two hundred sixteen".