129226109 has 2 divisors, whose sum is σ = 129226110. Its totient is φ = 129226108.

The previous prime is 129226099. The next prime is 129226127. The reversal of 129226109 is 901622921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67289209 + 61936900 = 8203^2 + 7870^2 .

It is an emirp because it is prime and its reverse (901622921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129226109 - 2⁴ = 129226093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129228109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64613054 + 64613055.

It is an arithmetic number, because the mean of its divisors is an integer number (64613055).

Almost surely, 2^129226109 is an apocalyptic number.

It is an amenable number.

129226109 is a deficient number, since it is larger than the sum of its proper divisors (1).

129226109 is an equidigital number, since it uses as much as digits as its factorization.

129226109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 129226109 is about 11367.7662273641. The cubic root of 129226109 is about 505.5724762968.

The spelling of 129226109 in words is "one hundred twenty-nine million, two hundred twenty-six thousand, one hundred nine".