12978169 has 2 divisors, whose sum is σ = 12978170. Its totient is φ = 12978168.

The previous prime is 12978139. The next prime is 12978211. The reversal of 12978169 is 96187921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6827769 + 6150400 = 2613^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 12978169 - 2¹¹ = 12976121 is a prime.

It is a super-2 number, since 2×12978169² = 336865741185122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12978139) 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, 6489084 + 6489085.

It is an arithmetic number, because the mean of its divisors is an integer number (6489085).

Almost surely, 2^12978169 is an apocalyptic number.

It is an amenable number.

12978169 is a deficient number, since it is larger than the sum of its proper divisors (1).

12978169 is an equidigital number, since it uses as much as digits as its factorization.

12978169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 43.

The square root of 12978169 is about 3602.5225884094. The cubic root of 12978169 is about 235.0017745452.

The spelling of 12978169 in words is "twelve million, nine hundred seventy-eight thousand, one hundred sixty-nine".