129636689 has 12 divisors (see below), whose sum is σ = 160430976. Its totient is φ = 102568752.

The previous prime is 129636673. The next prime is 129636697. The reversal of 129636689 is 986636921.

It is not a de Polignac number, because 129636689 - 2⁴ = 129636673 is a prime.

It is a super-2 number, since 2×129636689² = 33611342269765442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129636889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53609 + ... + 55974.

It is an arithmetic number, because the mean of its divisors is an integer number (13369248).

Almost surely, 2^129636689 is an apocalyptic number.

It is an amenable number.

129636689 is a deficient number, since it is larger than the sum of its proper divisors (30794287).

129636689 is a wasteful number, since it uses less digits than its factorization.

129636689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109616 (or 109603 counting only the distinct ones).

The product of its digits is 839808, while the sum is 50.

The square root of 129636689 is about 11385.8108626483. The cubic root of 129636689 is about 506.1073488437.

The spelling of 129636689 in words is "one hundred twenty-nine million, six hundred thirty-six thousand, six hundred eighty-nine".