12780169 has 2 divisors, whose sum is σ = 12780170. Its totient is φ = 12780168.

The previous prime is 12780149. The next prime is 12780181. The reversal of 12780169 is 96108721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8732025 + 4048144 = 2955^2 + 2012^2 .

It is a cyclic number.

It is not a de Polignac number, because 12780169 - 2¹¹ = 12778121 is a prime.

It is a super-2 number, since 2×12780169² = 326665439337122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12780139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390084 + 6390085.

It is an arithmetic number, because the mean of its divisors is an integer number (6390085).

Almost surely, 2^12780169 is an apocalyptic number.

It is an amenable number.

12780169 is a deficient number, since it is larger than the sum of its proper divisors (1).

12780169 is an equidigital number, since it uses as much as digits as its factorization.

12780169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 12780169 is about 3574.9362232073. The cubic root of 12780169 is about 233.8005520414.

The spelling of 12780169 in words is "twelve million, seven hundred eighty thousand, one hundred sixty-nine".