12789181 has 2 divisors, whose sum is σ = 12789182. Its totient is φ = 12789180.

The previous prime is 12789167. The next prime is 12789187. The reversal of 12789181 is 18198721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12313081 + 476100 = 3509^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 12789181 - 2⁵ = 12789149 is a prime.

It is a super-2 number, since 2×12789181² = 327126301301522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12789181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12789187) 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, 6394590 + 6394591.

It is an arithmetic number, because the mean of its divisors is an integer number (6394591).

Almost surely, 2^12789181 is an apocalyptic number.

It is an amenable number.

12789181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12789181 is an equidigital number, since it uses as much as digits as its factorization.

12789181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 37.

The square root of 12789181 is about 3576.1964431502. The cubic root of 12789181 is about 233.8554943381.

The spelling of 12789181 in words is "twelve million, seven hundred eighty-nine thousand, one hundred eighty-one".