129136646 has 16 divisors (see below), whose sum is σ = 196849440. Its totient is φ = 63524160.

The previous prime is 129136643. The next prime is 129136691. The reversal of 129136646 is 646631921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129136643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117170 + ... + 118266.

It is an arithmetic number, because the mean of its divisors is an integer number (12303090).

Almost surely, 2^129136646 is an apocalyptic number.

129136646 is a deficient number, since it is larger than the sum of its proper divisors (67712794).

129136646 is a wasteful number, since it uses less digits than its factorization.

129136646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999.

The product of its digits is 46656, while the sum is 38.

The square root of 129136646 is about 11363.8306041581. The cubic root of 129136646 is about 505.4557803949.

The spelling of 129136646 in words is "one hundred twenty-nine million, one hundred thirty-six thousand, six hundred forty-six".