129791161 has 4 divisors (see below), whose sum is σ = 131076324. Its totient is φ = 128506000.

The previous prime is 129791159. The next prime is 129791171. The reversal of 129791161 is 161197921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88266025 + 41525136 = 9395^2 + 6444^2 .

It is a cyclic number.

It is not a de Polignac number, because 129791161 - 2¹ = 129791159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129791161.

It is not an unprimeable number, because it can be changed into a prime (129791131) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 642430 + ... + 642631.

It is an arithmetic number, because the mean of its divisors is an integer number (32769081).

Almost surely, 2^129791161 is an apocalyptic number.

It is an amenable number.

129791161 is a deficient number, since it is larger than the sum of its proper divisors (1285163).

129791161 is a wasteful number, since it uses less digits than its factorization.

129791161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285162.

The product of its digits is 6804, while the sum is 37.

The square root of 129791161 is about 11392.5923739946. The cubic root of 129791161 is about 506.3082908849.

The spelling of 129791161 in words is "one hundred twenty-nine million, seven hundred ninety-one thousand, one hundred sixty-one".