129186044641 has 4 divisors (see below), whose sum is σ = 129186809284. Its totient is φ = 129185280000.

The previous prime is 129186044587. The next prime is 129186044681. The reversal of 129186044641 is 146440681921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 52844354641 + 76341690000 = 229879^2 + 276300^2 .

It is a cyclic number.

It is not a de Polignac number, because 129186044641 - 2¹¹ = 129186042593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129186044591 and 129186044600.

It is not an unprimeable number, because it can be changed into a prime (129186044681) 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, 4320 + ... + 508321.

It is an arithmetic number, because the mean of its divisors is an integer number (32296702321).

Almost surely, 2^129186044641 is an apocalyptic number.

It is an amenable number.

129186044641 is a deficient number, since it is larger than the sum of its proper divisors (764643).

129186044641 is an equidigital number, since it uses as much as digits as its factorization.

129186044641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764642.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 129186044641 in words is "one hundred twenty-nine billion, one hundred eighty-six million, forty-four thousand, six hundred forty-one".