129165897 has 16 divisors (see below), whose sum is σ = 197240832. Its totient is φ = 73652880.

The previous prime is 129165859. The next prime is 129165899. The reversal of 129165897 is 798561921.

It is not a de Polignac number, because 129165897 - 2¹⁵ = 129133129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129165899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4048 + ... + 16574.

It is an arithmetic number, because the mean of its divisors is an integer number (12327552).

Almost surely, 2^129165897 is an apocalyptic number.

It is an amenable number.

129165897 is a deficient number, since it is larger than the sum of its proper divisors (68074935).

129165897 is a wasteful number, since it uses less digits than its factorization.

129165897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13028.

The product of its digits is 272160, while the sum is 48.

The square root of 129165897 is about 11365.1175532856. The cubic root of 129165897 is about 505.4939414470.

The spelling of 129165897 in words is "one hundred twenty-nine million, one hundred sixty-five thousand, eight hundred ninety-seven".