13311616 has 16 divisors (see below), whose sum is σ = 26519490. Its totient is φ = 6655744.

The previous prime is 13311611. The next prime is 13311619. The reversal of 13311616 is 61611331.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12110400 + 1201216 = 3480^2 + 1096^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (13311611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51871 + ... + 52126.

Almost surely, 2^13311616 is an apocalyptic number.

13311616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13311616 is a deficient number, since it is larger than the sum of its proper divisors (13207874).

13311616 is an equidigital number, since it uses as much as digits as its factorization.

13311616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104011 (or 103999 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

The square root of 13311616 is about 3648.5087364566. The cubic root of 13311616 is about 236.9974066075.

Adding to 13311616 its reverse (61611331), we get a palindrome (74922947).

The spelling of 13311616 in words is "thirteen million, three hundred eleven thousand, six hundred sixteen".