129857155 has 16 divisors (see below), whose sum is σ = 159654240. Its totient is φ = 101357568.

The previous prime is 129857129. The next prime is 129857173. The reversal of 129857155 is 551758921.

It is a cyclic number.

It is not a de Polignac number, because 129857155 - 2¹³ = 129848963 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49876 + ... + 52414.

It is an arithmetic number, because the mean of its divisors is an integer number (9978390).

Almost surely, 2^129857155 is an apocalyptic number.

129857155 is a deficient number, since it is larger than the sum of its proper divisors (29797085).

129857155 is a wasteful number, since it uses less digits than its factorization.

129857155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790.

The product of its digits is 126000, while the sum is 43.

The square root of 129857155 is about 11395.4883616280. The cubic root of 129857155 is about 506.3940893516.

The spelling of 129857155 in words is "one hundred twenty-nine million, eight hundred fifty-seven thousand, one hundred fifty-five".