129684229 has 2 divisors, whose sum is σ = 129684230. Its totient is φ = 129684228.

The previous prime is 129684209. The next prime is 129684239. The reversal of 129684229 is 922486921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112890625 + 16793604 = 10625^2 + 4098^2 .

It is a cyclic number.

It is not a de Polignac number, because 129684229 - 2⁵ = 129684197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129684209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64842114 + 64842115.

It is an arithmetic number, because the mean of its divisors is an integer number (64842115).

Almost surely, 2^129684229 is an apocalyptic number.

It is an amenable number.

129684229 is a deficient number, since it is larger than the sum of its proper divisors (1).

129684229 is an equidigital number, since it uses as much as digits as its factorization.

129684229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 129684229 is about 11387.8983574670. The cubic root of 129684229 is about 506.1692073681.

It can be divided in two parts, 129 and 684229, that multiplied together give a triangular number (88265541 = T₁₃₂₈₆).

The spelling of 129684229 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, two hundred twenty-nine".