12181333 has 4 divisors (see below), whose sum is σ = 12897900. Its totient is φ = 11464768.

The previous prime is 12181313. The next prime is 12181339. The reversal of 12181333 is 33318121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3378244 + 8803089 = 1838^2 + 2967^2 .

It is a cyclic number.

It is not a de Polignac number, because 12181333 - 2⁹ = 12180821 is a prime.

It is a super-4 number, since 4×12181333⁴ (a number of 29 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358258 + ... + 358291.

It is an arithmetic number, because the mean of its divisors is an integer number (3224475).

Almost surely, 2^12181333 is an apocalyptic number.

It is an amenable number.

12181333 is a deficient number, since it is larger than the sum of its proper divisors (716567).

12181333 is an equidigital number, since it uses as much as digits as its factorization.

12181333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716566.

The product of its digits is 432, while the sum is 22.

The square root of 12181333 is about 3490.1766430942. The cubic root of 12181333 is about 230.0902796187.

Adding to 12181333 its reverse (33318121), we get a palindrome (45499454).

The spelling of 12181333 in words is "twelve million, one hundred eighty-one thousand, three hundred thirty-three".