13115556 has 18 divisors (see below), whose sum is σ = 33153302. Its totient is φ = 4371840.

The previous prime is 13115537. The next prime is 13115563. The reversal of 13115556 is 65551131.

It can be written as a sum of positive squares in only one way, i.e., 11451456 + 1664100 = 3384^2 + 1290^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182125 + ... + 182196.

Almost surely, 2^13115556 is an apocalyptic number.

It is an amenable number.

13115556 is an abundant number, since it is smaller than the sum of its proper divisors (20037746).

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

13115556 is a wasteful number, since it uses less digits than its factorization.

13115556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364331 (or 364326 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 13115556 is about 3621.5405561722. The cubic root of 13115556 is about 235.8281090573.

Adding to 13115556 its reverse (65551131), we get a palindrome (78666687).

The spelling of 13115556 in words is "thirteen million, one hundred fifteen thousand, five hundred fifty-six".