129255569 has 2 divisors, whose sum is σ = 129255570. Its totient is φ = 129255568.

The previous prime is 129255521. The next prime is 129255587. The reversal of 129255569 is 965552921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66259600 + 62995969 = 8140^2 + 7937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129255569 is a prime.

It is a super-2 number, since 2×129255569² = 33414004235027522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129255769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64627784 + 64627785.

It is an arithmetic number, because the mean of its divisors is an integer number (64627785).

Almost surely, 2^129255569 is an apocalyptic number.

It is an amenable number.

129255569 is a deficient number, since it is larger than the sum of its proper divisors (1).

129255569 is an equidigital number, since it uses as much as digits as its factorization.

129255569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243000, while the sum is 44.

The square root of 129255569 is about 11369.0619226038. The cubic root of 129255569 is about 505.6108922526.

The spelling of 129255569 in words is "one hundred twenty-nine million, two hundred fifty-five thousand, five hundred sixty-nine".