129268161 has 12 divisors (see below), whose sum is σ = 203695440. Its totient is φ = 78344280.

The previous prime is 129268159. The next prime is 129268199. The reversal of 129268161 is 161862921.

It is not a de Polignac number, because 129268161 - 2¹ = 129268159 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (129268141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 652771 + ... + 652968.

It is an arithmetic number, because the mean of its divisors is an integer number (16974620).

Almost surely, 2^129268161 is an apocalyptic number.

129268161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129268161 is a deficient number, since it is larger than the sum of its proper divisors (74427279).

129268161 is a wasteful number, since it uses less digits than its factorization.

129268161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305756 (or 1305753 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 129268161 is about 11369.6156927136. The cubic root of 129268161 is about 505.6273104894.

The spelling of 129268161 in words is "one hundred twenty-nine million, two hundred sixty-eight thousand, one hundred sixty-one".