129771569 has 2 divisors, whose sum is σ = 129771570. Its totient is φ = 129771568.

The previous prime is 129771533. The next prime is 129771581. The reversal of 129771569 is 965177921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115240225 + 14531344 = 10735^2 + 3812^2 .

It is an emirp because it is prime and its reverse (965177921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129771569 is a prime.

It is a super-2 number, since 2×129771569² = 33681320241443522, 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 (129770569) 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, 64885784 + 64885785.

It is an arithmetic number, because the mean of its divisors is an integer number (64885785).

Almost surely, 2^129771569 is an apocalyptic number.

It is an amenable number.

129771569 is a deficient number, since it is larger than the sum of its proper divisors (1).

129771569 is an equidigital number, since it uses as much as digits as its factorization.

129771569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 238140, while the sum is 47.

The square root of 129771569 is about 11391.7324845697. The cubic root of 129771569 is about 506.2828138259.

The spelling of 129771569 in words is "one hundred twenty-nine million, seven hundred seventy-one thousand, five hundred sixty-nine".