12181427 has 4 divisors (see below), whose sum is σ = 12464760. Its totient is φ = 11898096.

The previous prime is 12181423. The next prime is 12181447. The reversal of 12181427 is 72418121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72418121 = 2011 ⋅36011.

It is a cyclic number.

It is not a de Polignac number, because 12181427 - 2² = 12181423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12181396 and 12181405.

It is not an unprimeable number, because it can be changed into a prime (12181423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141602 + ... + 141687.

It is an arithmetic number, because the mean of its divisors is an integer number (3116190).

Almost surely, 2^12181427 is an apocalyptic number.

12181427 is a deficient number, since it is larger than the sum of its proper divisors (283333).

12181427 is an equidigital number, since it uses as much as digits as its factorization.

12181427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283332.

The product of its digits is 896, while the sum is 26.

The square root of 12181427 is about 3490.1901094353. The cubic root of 12181427 is about 230.0908714650.

Adding to 12181427 its reverse (72418121), we get a palindrome (84599548).

The spelling of 12181427 in words is "twelve million, one hundred eighty-one thousand, four hundred twenty-seven".