231616 has 56 divisors (see below), whose sum is σ = 585216. Its totient is φ = 88320.

The previous prime is 231613. The next prime is 231631. The reversal of 231616 is 616132.

231616 = 16³ + 17³ + ... + 31³.

231616 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 231593 and 231602.

It is not an unprimeable number, because it can be changed into a prime (231611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4905 + ... + 4951.

2²³¹⁶¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292608).

231616 is an abundant number, since it is smaller than the sum of its proper divisors (353600).

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

231616 is a wasteful number, since it uses less digits than its factorization.

231616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 67 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 231616 is about 481.2649997662. The cubic root of 231616 is about 61.4124163652.

Adding to 231616 its reverse (616132), we get a palindrome (847748).

It can be divided in two parts, 2316 and 16, that added together give a palindrome (2332).

The spelling of 231616 in words is "two hundred thirty-one thousand, six hundred sixteen".