129043841 has 2 divisors, whose sum is σ = 129043842. Its totient is φ = 129043840.

The previous prime is 129043829. The next prime is 129043861. The reversal of 129043841 is 148340921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101586241 + 27457600 = 10079^2 + 5240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129043841 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 129043798 and 129043807.

It is not a weakly prime, because it can be changed into another prime (129043861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64521920 + 64521921.

It is an arithmetic number, because the mean of its divisors is an integer number (64521921).

Almost surely, 2^129043841 is an apocalyptic number.

It is an amenable number.

129043841 is a deficient number, since it is larger than the sum of its proper divisors (1).

129043841 is an equidigital number, since it uses as much as digits as its factorization.

129043841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 129043841 is about 11359.7465200593. The cubic root of 129043841 is about 505.3346682067.

The spelling of 129043841 in words is "one hundred twenty-nine million, forty-three thousand, eight hundred forty-one".