13231616 has 40 divisors (see below), whose sum is σ = 27097224. Its totient is φ = 6451200.

The previous prime is 13231591. The next prime is 13231633. The reversal of 13231616 is 61613231.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13231591 and 13231600.

It is a congruent number.

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, 21716 + ... + 22316.

Almost surely, 2^13231616 is an apocalyptic number.

13231616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13231616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13548612).

13231616 is an abundant number, since it is smaller than the sum of its proper divisors (13865608).

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

13231616 is an frugal number, since it uses more digits than its factorization.

13231616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 646 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

The square root of 13231616 is about 3637.5288315009. The cubic root of 13231616 is about 236.5216842184.

Adding to 13231616 its reverse (61613231), we get a palindrome (74844847).

The spelling of 13231616 in words is "thirteen million, two hundred thirty-one thousand, six hundred sixteen".