129040569 has 36 divisors (see below), whose sum is σ = 223841280. Its totient is φ = 71351280.

The previous prime is 129040553. The next prime is 129040573. The reversal of 129040569 is 965040921.

129040569 is a `hidden beast` number, since 1 + 2 + 90 + 4 + 0 + 569 = 666.

It is not a de Polignac number, because 129040569 - 2⁴ = 129040553 is a prime.

It is a super-2 number, since 2×129040569² = 33302936895687522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129040519) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8952 + ... + 18390.

Almost surely, 2^129040569 is an apocalyptic number.

It is an amenable number.

129040569 is a deficient number, since it is larger than the sum of its proper divisors (94800711).

129040569 is a wasteful number, since it uses less digits than its factorization.

129040569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9490 (or 9480 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 129040569 is about 11359.6025018484. The cubic root of 129040569 is about 505.3303971285.

The spelling of 129040569 in words is "one hundred twenty-nine million, forty thousand, five hundred sixty-nine".