12181281 has 16 divisors (see below), whose sum is σ = 18643968. Its totient is φ = 6930000.

The previous prime is 12181271. The next prime is 12181289. The reversal of 12181281 is 18218121.

It is not a de Polignac number, because 12181281 - 2⁵ = 12181249 is a prime.

It is a super-2 number, since 2×12181281² = 296767213601922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12181289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4116 + ... + 6426.

It is an arithmetic number, because the mean of its divisors is an integer number (1165248).

Almost surely, 2^12181281 is an apocalyptic number.

It is an amenable number.

12181281 is a deficient number, since it is larger than the sum of its proper divisors (6462687).

12181281 is a wasteful number, since it uses less digits than its factorization.

12181281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572.

The product of its digits is 256, while the sum is 24.

The square root of 12181281 is about 3490.1691936065. The cubic root of 12181281 is about 230.0899522130.

The spelling of 12181281 in words is "twelve million, one hundred eighty-one thousand, two hundred eighty-one".