11771 has 4 divisors (see below), whose sum is σ = 12000. Its totient is φ = 11544.

The previous prime is 11743. The next prime is 11777. The reversal of 11771 is 17711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17711 = 89 ⋅199.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5 + ... + 153.

It is an arithmetic number, because the mean of its divisors is an integer number (3000).

2¹¹⁷⁷¹ is an apocalyptic number.

11771 is a deficient number, since it is larger than the sum of its proper divisors (229).

11771 is an equidigital number, since it uses as much as digits as its factorization.

11771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its digits is 49, while the sum is 17.

The square root of 11771 is about 108.4942394784. The cubic root of 11771 is about 22.7477154249.

The spelling of 11771 in words is "eleven thousand, seven hundred seventy-one", and thus it is an iban number.