129056769 has 12 divisors (see below), whose sum is σ = 186514276. Its totient is φ = 85992192.

The previous prime is 129056761. The next prime is 129056779. The reversal of 129056769 is 967650921.

It is a happy number.

129056769 is a `hidden beast` number, since 1 + 29 + 0 + 567 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 85655025 + 43401744 = 9255^2 + 6588^2 .

It is not a de Polignac number, because 129056769 - 2³ = 129056761 is a prime.

It is a super-2 number, since 2×129056769² = 33311299249438722, which contains 22 as substring.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129056761) 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, 28809 + ... + 32985.

It is a Proth number, since it is equal to 7877 ⋅ 2¹⁴ + 1 and 7877 < 2¹⁴.

Almost surely, 2^129056769 is an apocalyptic number.

It is an amenable number.

129056769 is a deficient number, since it is larger than the sum of its proper divisors (57457507).

129056769 is a wasteful number, since it uses less digits than its factorization.

129056769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7616 (or 7613 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 129056769 is about 11360.3155325898. The cubic root of 129056769 is about 505.3515429587.

The spelling of 129056769 in words is "one hundred twenty-nine million, fifty-six thousand, seven hundred sixty-nine".