129156829 has 2 divisors, whose sum is σ = 129156830. Its totient is φ = 129156828.

The previous prime is 129156809. The next prime is 129156869. The reversal of 129156829 is 928651921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94051204 + 35105625 = 9698^2 + 5925^2 .

It is a cyclic number.

It is not a de Polignac number, because 129156829 - 2¹⁹ = 128632541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129156809) 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, 64578414 + 64578415.

It is an arithmetic number, because the mean of its divisors is an integer number (64578415).

Almost surely, 2^129156829 is an apocalyptic number.

It is an amenable number.

129156829 is a deficient number, since it is larger than the sum of its proper divisors (1).

129156829 is an equidigital number, since it uses as much as digits as its factorization.

129156829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 129156829 is about 11364.7186062832. The cubic root of 129156829 is about 505.4821118892.

The spelling of 129156829 in words is "one hundred twenty-nine million, one hundred fifty-six thousand, eight hundred twenty-nine".