12291 has 8 divisors (see below), whose sum is σ = 17424. Its totient is φ = 7680.

The previous prime is 12289. The next prime is 12301. The reversal of 12291 is 19221.

It is a happy number.

12291 is nontrivially palindromic in base 2, base 4, base 8 and base 16.

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

It is not a de Polignac number, because 12291 - 2¹ = 12289 is a prime.

It is a plaindrome in base 14.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 12291.

It is not an unprimeable number, because it can be changed into a prime (12211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70 + ... + 171.

It is an arithmetic number, because the mean of its divisors is an integer number (2178).

2¹²²⁹¹ is an apocalyptic number.

12291 is a deficient number, since it is larger than the sum of its proper divisors (5133).

12291 is a wasteful number, since it uses less digits than its factorization.

12291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its digits is 36, while the sum is 15.

The square root of 12291 is about 110.8647825055. The cubic root of 12291 is about 23.0778709012.

It can be divided in two parts, 12 and 291, that added together give a palindrome (303).

The spelling of 12291 in words is "twelve thousand, two hundred ninety-one".