129128507 has 2 divisors, whose sum is σ = 129128508. Its totient is φ = 129128506.

The previous prime is 129128491. The next prime is 129128533. The reversal of 129128507 is 705821921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129128507 - 2⁴ = 129128491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129128567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64564253 + 64564254.

It is an arithmetic number, because the mean of its divisors is an integer number (64564254).

Almost surely, 2^129128507 is an apocalyptic number.

129128507 is a deficient number, since it is larger than the sum of its proper divisors (1).

129128507 is an equidigital number, since it uses as much as digits as its factorization.

129128507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 129128507 is about 11363.4724886366. The cubic root of 129128507 is about 505.4451611758.

The spelling of 129128507 in words is "one hundred twenty-nine million, one hundred twenty-eight thousand, five hundred seven".