11291 has 4 divisors (see below), whose sum is σ = 12912. Its totient is φ = 9672.

The previous prime is 11287. The next prime is 11299. The reversal of 11291 is 19211.

11291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11291 - 2² = 11287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11299) 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 in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 813.

It is an arithmetic number, because the mean of its divisors is an integer number (3228).

2¹¹²⁹¹ is an apocalyptic number.

11291 is a deficient number, since it is larger than the sum of its proper divisors (1621).

11291 is an equidigital number, since it uses as much as digits as its factorization.

11291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620.

The product of its digits is 18, while the sum is 14.

The square root of 11291 is about 106.2591172559. The cubic root of 11291 is about 22.4342111162.

The spelling of 11291 in words is "eleven thousand, two hundred ninety-one".