129012665 has 8 divisors (see below), whose sum is σ = 156185928. Its totient is φ = 102296320.

The previous prime is 129012659. The next prime is 129012671. The reversal of 129012665 is 566210921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129012659) and next prime (129012671).

It can be written as a sum of positive squares in 4 ways, for example, as 779689 + 128232976 = 883^2 + 11324^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129012665 - 2⁴ = 129012649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113606 + ... + 114735.

It is an arithmetic number, because the mean of its divisors is an integer number (19523241).

Almost surely, 2^129012665 is an apocalyptic number.

It is an amenable number.

129012665 is a deficient number, since it is larger than the sum of its proper divisors (27173263).

129012665 is a wasteful number, since it uses less digits than its factorization.

129012665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228459.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 129012665 is about 11358.3742234529. The cubic root of 129012665 is about 505.2939699387.

The spelling of 129012665 in words is "one hundred twenty-nine million, twelve thousand, six hundred sixty-five".