129180813 has 16 divisors (see below), whose sum is σ = 178354176. Its totient is φ = 83081520.

The previous prime is 129180797. The next prime is 129180823. The reversal of 129180813 is 318081921.

It is not a de Polignac number, because 129180813 - 2⁴ = 129180797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129180823) 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, 30270 + ... + 34272.

It is an arithmetic number, because the mean of its divisors is an integer number (11147136).

Almost surely, 2^129180813 is an apocalyptic number.

It is an amenable number.

129180813 is a deficient number, since it is larger than the sum of its proper divisors (49173363).

129180813 is a wasteful number, since it uses less digits than its factorization.

129180813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 129180813 is about 11365.7737528072. The cubic root of 129180813 is about 505.5133987434.

The spelling of 129180813 in words is "one hundred twenty-nine million, one hundred eighty thousand, eight hundred thirteen".