12780181 has 2 divisors, whose sum is σ = 12780182. Its totient is φ = 12780180.

The previous prime is 12780169. The next prime is 12780197. The reversal of 12780181 is 18108721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8071281 + 4708900 = 2841^2 + 2170^2 .

It is an emirp because it is prime and its reverse (18108721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12780181 - 2⁵ = 12780149 is a prime.

It is a super-2 number, since 2×12780181² = 326666052785522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12780121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390090 + 6390091.

It is an arithmetic number, because the mean of its divisors is an integer number (6390091).

Almost surely, 2^12780181 is an apocalyptic number.

It is an amenable number.

12780181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12780181 is an equidigital number, since it uses as much as digits as its factorization.

12780181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 12780181 is about 3574.9379015586. The cubic root of 12780181 is about 233.8006252174.

It can be divided in two parts, 127 and 80181, that added together give a palindrome (80308).

The spelling of 12780181 in words is "twelve million, seven hundred eighty thousand, one hundred eighty-one".