129356441 has 2 divisors, whose sum is σ = 129356442. Its totient is φ = 129356440.

The previous prime is 129356429. The next prime is 129356449. The reversal of 129356441 is 144653921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125440000 + 3916441 = 11200^2 + 1979^2 .

It is a cyclic number.

It is not a de Polignac number, because 129356441 - 2⁶ = 129356377 is a prime.

It is not a weakly prime, because it can be changed into another prime (129356449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64678220 + 64678221.

It is an arithmetic number, because the mean of its divisors is an integer number (64678221).

Almost surely, 2^129356441 is an apocalyptic number.

It is an amenable number.

129356441 is a deficient number, since it is larger than the sum of its proper divisors (1).

129356441 is an equidigital number, since it uses as much as digits as its factorization.

129356441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 129356441 is about 11373.4973073369. The cubic root of 129356441 is about 505.7423855431.

The spelling of 129356441 in words is "one hundred twenty-nine million, three hundred fifty-six thousand, four hundred forty-one".