129139 has 4 divisors (see below), whose sum is σ = 130680. Its totient is φ = 127600.

The previous prime is 129127. The next prime is 129169. The reversal of 129139 is 931921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129139 - 2⁷ = 129011 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (129119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637 + ... + 814.

It is an arithmetic number, because the mean of its divisors is an integer number (32670).

2¹²⁹¹³⁹ is an apocalyptic number.

129139 is a deficient number, since it is larger than the sum of its proper divisors (1541).

129139 is an equidigital number, since it uses as much as digits as its factorization.

129139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540.

The product of its digits is 486, while the sum is 25.

The square root of 129139 is about 359.3591518245. The cubic root of 129139 is about 50.5458851652.

The spelling of 129139 in words is "one hundred twenty-nine thousand, one hundred thirty-nine".