12120181 has 2 divisors, whose sum is σ = 12120182. Its totient is φ = 12120180.

The previous prime is 12120179. The next prime is 12120223. The reversal of 12120181 is 18102121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10297681 + 1822500 = 3209^2 + 1350^2 .

It is an emirp because it is prime and its reverse (18102121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12120181 - 2¹ = 12120179 is a prime.

It is a super-2 number, since 2×12120181² = 293797574945522, which contains 22 as substring.

Together with 12120179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12120781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060090 + 6060091.

It is an arithmetic number, because the mean of its divisors is an integer number (6060091).

Almost surely, 2^12120181 is an apocalyptic number.

It is an amenable number.

12120181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120181 is an equidigital number, since it uses as much as digits as its factorization.

12120181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 12120181 is about 3481.4050324546. The cubic root of 12120181 is about 229.7046050260.

It can be divided in two parts, 121 and 20181, that added together give a palindrome (20302).

The spelling of 12120181 in words is "twelve million, one hundred twenty thousand, one hundred eighty-one".