129042241 has 2 divisors, whose sum is σ = 129042242. Its totient is φ = 129042240.

The previous prime is 129042233. The next prime is 129042253. The reversal of 129042241 is 142240921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81721600 + 47320641 = 9040^2 + 6879^2 .

It is a cyclic number.

It is not a de Polignac number, because 129042241 - 2³ = 129042233 is a prime.

It is not a weakly prime, because it can be changed into another prime (129042041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64521120 + 64521121.

It is an arithmetic number, because the mean of its divisors is an integer number (64521121).

Almost surely, 2^129042241 is an apocalyptic number.

It is an amenable number.

129042241 is a deficient number, since it is larger than the sum of its proper divisors (1).

129042241 is an equidigital number, since it uses as much as digits as its factorization.

129042241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 129042241 is about 11359.6760957344. The cubic root of 129042241 is about 505.3325796689.

The spelling of 129042241 in words is "one hundred twenty-nine million, forty-two thousand, two hundred forty-one".