129209853 has 16 divisors (see below), whose sum is σ = 173859840. Its totient is φ = 85354416.

The previous prime is 129209849. The next prime is 129209869. The reversal of 129209853 is 358902921.

It is not a de Polignac number, because 129209853 - 2² = 129209849 is a prime.

It is a super-2 number, since 2×129209853² = 33390372224563218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129209803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219826 + ... + 220412.

It is an arithmetic number, because the mean of its divisors is an integer number (10866240).

Almost surely, 2^129209853 is an apocalyptic number.

It is an amenable number.

129209853 is a deficient number, since it is larger than the sum of its proper divisors (44649987).

129209853 is a wasteful number, since it uses less digits than its factorization.

129209853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 129209853 is about 11367.0512007292. The cubic root of 129209853 is about 505.5512759092.

The spelling of 129209853 in words is "one hundred twenty-nine million, two hundred nine thousand, eight hundred fifty-three".