11156 has 6 divisors (see below), whose sum is σ = 19530. Its totient is φ = 5576.

The previous prime is 11149. The next prime is 11159. The reversal of 11156 is 65111.

11156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10000 + 1156 = 100^2 + 34^2 .

It is a plaindrome in base 10 and base 15.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 11156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11159) by changing a digit.

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 as a sum of consecutive naturals, namely, 1391 + ... + 1398.

It is an arithmetic number, because the mean of its divisors is an integer number (3255).

2¹¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

11156 is a deficient number, since it is larger than the sum of its proper divisors (8374).

11156 is a wasteful number, since it uses less digits than its factorization.

11156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793 (or 2791 counting only the distinct ones).

The product of its digits is 30, while the sum is 14.

The square root of 11156 is about 105.6219674121. The cubic root of 11156 is about 22.3444413938.

Adding to 11156 its reverse (65111), we get a palindrome (76267).

It can be divided in two parts, 111 and 56, that multiplied together give a triangular number (6216 = T₁₁₁).

The spelling of 11156 in words is "eleven thousand, one hundred fifty-six".