129836569 has 2 divisors, whose sum is σ = 129836570. Its totient is φ = 129836568.

The previous prime is 129836503. The next prime is 129836573. The reversal of 129836569 is 965638921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125888400 + 3948169 = 11220^2 + 1987^2 .

It is a cyclic number.

It is not a de Polignac number, because 129836569 - 2¹¹ = 129834521 is a prime.

It is a super-2 number, since 2×129836569² = 33715069299383522, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (129836269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64918284 + 64918285.

It is an arithmetic number, because the mean of its divisors is an integer number (64918285).

Almost surely, 2^129836569 is an apocalyptic number.

It is an amenable number.

129836569 is a deficient number, since it is larger than the sum of its proper divisors (1).

129836569 is an equidigital number, since it uses as much as digits as its factorization.

129836569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 129836569 is about 11394.5850736216. The cubic root of 129836569 is about 506.3673287169.

The spelling of 129836569 in words is "one hundred twenty-nine million, eight hundred thirty-six thousand, five hundred sixty-nine".