12181261 has 8 divisors (see below), whose sum is σ = 12854880. Its totient is φ = 11510928.

The previous prime is 12181259. The next prime is 12181271. The reversal of 12181261 is 16218121.

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

It is a cyclic number.

It is not a de Polignac number, because 12181261 - 2¹ = 12181259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12181271) 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, 12390 + ... + 13336.

It is an arithmetic number, because the mean of its divisors is an integer number (1606860).

Almost surely, 2^12181261 is an apocalyptic number.

It is an amenable number.

12181261 is a deficient number, since it is larger than the sum of its proper divisors (673619).

12181261 is an equidigital number, since it uses as much as digits as its factorization.

12181261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its digits is 192, while the sum is 22.

The square root of 12181261 is about 3490.1663284147. The cubic root of 12181261 is about 230.0898262875.

Adding to 12181261 its reverse (16218121), we get a palindrome (28399382).

The spelling of 12181261 in words is "twelve million, one hundred eighty-one thousand, two hundred sixty-one".