129217169 has 2 divisors, whose sum is σ = 129217170. Its totient is φ = 129217168.

The previous prime is 129217163. The next prime is 129217183. The reversal of 129217169 is 961712921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75047569 + 54169600 = 8663^2 + 7360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129217169 is a prime.

It is a super-2 number, since 2×129217169² = 33394153528749122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (129217163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64608584 + 64608585.

It is an arithmetic number, because the mean of its divisors is an integer number (64608585).

Almost surely, 2^129217169 is an apocalyptic number.

It is an amenable number.

129217169 is a deficient number, since it is larger than the sum of its proper divisors (1).

129217169 is an equidigital number, since it uses as much as digits as its factorization.

129217169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 38.

The square root of 129217169 is about 11367.3730034692. The cubic root of 129217169 is about 505.5608173470.

The spelling of 129217169 in words is "one hundred twenty-nine million, two hundred seventeen thousand, one hundred sixty-nine".