129518845 has 4 divisors (see below), whose sum is σ = 155422620. Its totient is φ = 103615072.

The previous prime is 129518813. The next prime is 129518849. The reversal of 129518845 is 548815921.

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 53846244 + 75672601 = 7338^2 + 8699^2 .

It is a cyclic number.

It is not a de Polignac number, because 129518845 - 2⁵ = 129518813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129518849) 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, 12951880 + ... + 12951889.

It is an arithmetic number, because the mean of its divisors is an integer number (38855655).

Almost surely, 2^129518845 is an apocalyptic number.

It is an amenable number.

129518845 is a deficient number, since it is larger than the sum of its proper divisors (25903775).

129518845 is an equidigital number, since it uses as much as digits as its factorization.

129518845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25903774.

The product of its digits is 115200, while the sum is 43.

The square root of 129518845 is about 11380.6346483841. The cubic root of 129518845 is about 505.9539462947.

The spelling of 129518845 in words is "one hundred twenty-nine million, five hundred eighteen thousand, eight hundred forty-five".