129366169 has 2 divisors, whose sum is σ = 129366170. Its totient is φ = 129366168.

The previous prime is 129366109. The next prime is 129366199. The reversal of 129366169 is 961663921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86266944 + 43099225 = 9288^2 + 6565^2 .

It is a cyclic number.

It is not a de Polignac number, because 129366169 - 2⁹ = 129365657 is a prime.

It is a super-2 number, since 2×129366169² = 33471211363473122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129366109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64683084 + 64683085.

It is an arithmetic number, because the mean of its divisors is an integer number (64683085).

Almost surely, 2^129366169 is an apocalyptic number.

It is an amenable number.

129366169 is a deficient number, since it is larger than the sum of its proper divisors (1).

129366169 is an equidigital number, since it uses as much as digits as its factorization.

129366169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 129366169 is about 11373.9249601885. The cubic root of 129366169 is about 505.7550630167.

The spelling of 129366169 in words is "one hundred twenty-nine million, three hundred sixty-six thousand, one hundred sixty-nine".