129081387 has 8 divisors (see below), whose sum is σ = 172201536. Its totient is φ = 86007752.

The previous prime is 129081373. The next prime is 129081389. The reversal of 129081387 is 783180921.

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 129081387 - 2⁷ = 129081259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129081389) 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, 4533 + ... + 16694.

It is an arithmetic number, because the mean of its divisors is an integer number (21525192).

Almost surely, 2^129081387 is an apocalyptic number.

129081387 is a deficient number, since it is larger than the sum of its proper divisors (43120149).

129081387 is a wasteful number, since it uses less digits than its factorization.

129081387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23257.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 129081387 is about 11361.3989895611. The cubic root of 129081387 is about 505.3836734013.

The spelling of 129081387 in words is "one hundred twenty-nine million, eighty-one thousand, three hundred eighty-seven".