11155 has 8 divisors (see below), whose sum is σ = 14112. Its totient is φ = 8448.

The previous prime is 11149. The next prime is 11159. The reversal of 11155 is 55111.

Adding to 11155 its reverse (55111), we get a palindrome (66266).

Subtracting 11155 from its reverse (55111), we obtain a triangular number (43956 = T_{296}).

It can be divided in two parts, 111 and 55, that multiplied together give a triangular number (6105 = T_{110}).

11155 = 10^{2} + 11^{2} + ... + 32^{2}.

11155 is nontrivially palindromic in base 7.

11155 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 8-Lehmer number, since φ(11155) divides (11155-1)^{8}.

It is a cyclic number.

It is not a de Polignac number, because 11155 - 2^{7} = 11027 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a plaindrome in base 10 and base 15.

It is a nialpdrome in base 11.

It is a zygodrome in base 10.

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

It is a nontrivial repunit in base 22.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67 + ... + 163.

It is an arithmetic number, because the mean of its divisors is an integer number (1764).

2^{11155} is an apocalyptic number.

11155 is a deficient number, since it is larger than the sum of its proper divisors (2957).

11155 is an equidigital number, since it uses as much as digits as its factorization.

11155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125.

The product of its digits is 25, while the sum is 13.

The square root of 11155 is about 105.6172334423. The cubic root of 11155 is about 22.3437737379.

The spelling of 11155 in words is "eleven thousand, one hundred fifty-five".

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