129605029 has 2 divisors, whose sum is σ = 129605030. Its totient is φ = 129605028.

The previous prime is 129605027. The next prime is 129605057. The reversal of 129605029 is 920506921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87329025 + 42276004 = 9345^2 + 6502^2 .

It is a cyclic number.

It is not a de Polignac number, because 129605029 - 2¹ = 129605027 is a prime.

Together with 129605027, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 129604985 and 129605003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129605027) 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 as a sum of consecutive naturals, namely, 64802514 + 64802515.

It is an arithmetic number, because the mean of its divisors is an integer number (64802515).

Almost surely, 2^129605029 is an apocalyptic number.

It is an amenable number.

129605029 is a deficient number, since it is larger than the sum of its proper divisors (1).

129605029 is an equidigital number, since it uses as much as digits as its factorization.

129605029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 129605029 is about 11384.4204507739. The cubic root of 129605029 is about 506.0661448107.

The spelling of 129605029 in words is "one hundred twenty-nine million, six hundred five thousand, twenty-nine".