129141785 has 16 divisors (see below), whose sum is σ = 161187840. Its totient is φ = 99207360.

The previous prime is 129141773. The next prime is 129141811. The reversal of 129141785 is 587141921.

It is not a de Polignac number, because 129141785 - 2⁴ = 129141769 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25364 + ... + 30026.

It is an arithmetic number, because the mean of its divisors is an integer number (10074240).

Almost surely, 2^129141785 is an apocalyptic number.

It is an amenable number.

129141785 is a deficient number, since it is larger than the sum of its proper divisors (32046055).

129141785 is a wasteful number, since it uses less digits than its factorization.

129141785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4888.

The product of its digits is 20160, while the sum is 38.

The square root of 129141785 is about 11364.0567140436. The cubic root of 129141785 is about 505.4624851862.

The spelling of 129141785 in words is "one hundred twenty-nine million, one hundred forty-one thousand, seven hundred eighty-five".