12819181 has 2 divisors, whose sum is σ = 12819182. Its totient is φ = 12819180.

The previous prime is 12819179. The next prime is 12819197. The reversal of 12819181 is 18191821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9455625 + 3363556 = 3075^2 + 1834^2 .

It is a cyclic number.

It is not a de Polignac number, because 12819181 - 2¹ = 12819179 is a prime.

It is a super-2 number, since 2×12819181² = 328662803021522, which contains 22 as substring.

Together with 12819179, 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 (12819881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6409590 + 6409591.

It is an arithmetic number, because the mean of its divisors is an integer number (6409591).

Almost surely, 2^12819181 is an apocalyptic number.

It is an amenable number.

12819181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12819181 is an equidigital number, since it uses as much as digits as its factorization.

12819181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 31.

The square root of 12819181 is about 3580.3883867536. The cubic root of 12819181 is about 234.0382057081.

It can be divided in two parts, 1 and 2819181, that added together give a palindrome (2819182).

The spelling of 12819181 in words is "twelve million, eight hundred nineteen thousand, one hundred eighty-one".