129135385 has 8 divisors (see below), whose sum is σ = 155023560. Its totient is φ = 103267584.

The previous prime is 129135379. The next prime is 129135389. The reversal of 129135385 is 583531921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14837904 + 114297481 = 3852^2 + 10691^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 129135385 - 2¹¹ = 129133337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129135389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21249 + ... + 26641.

It is an arithmetic number, because the mean of its divisors is an integer number (19377945).

Almost surely, 2^129135385 is an apocalyptic number.

It is an amenable number.

129135385 is a deficient number, since it is larger than the sum of its proper divisors (25888175).

129135385 is an equidigital number, since it uses as much as digits as its factorization.

129135385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10187.

The product of its digits is 32400, while the sum is 37.

The square root of 129135385 is about 11363.7751209710. The cubic root of 129135385 is about 505.4541351562.

The spelling of 129135385 in words is "one hundred twenty-nine million, one hundred thirty-five thousand, three hundred eighty-five".