12181867 has 2 divisors, whose sum is σ = 12181868. Its totient is φ = 12181866.

The previous prime is 12181861. The next prime is 12181909. The reversal of 12181867 is 76818121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12181867 - 2³ = 12181859 is a prime.

It is not a weakly prime, because it can be changed into another prime (12181861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090933 + 6090934.

It is an arithmetic number, because the mean of its divisors is an integer number (6090934).

Almost surely, 2^12181867 is an apocalyptic number.

12181867 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181867 is an equidigital number, since it uses as much as digits as its factorization.

12181867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 34.

The square root of 12181867 is about 3490.2531426818. The cubic root of 12181867 is about 230.0936417689.

Adding to 12181867 its reverse (76818121), we get a palindrome (88999988).

The spelling of 12181867 in words is "twelve million, one hundred eighty-one thousand, eight hundred sixty-seven".