129133909 has 2 divisors, whose sum is σ = 129133910. Its totient is φ = 129133908.

The previous prime is 129133903. The next prime is 129133931. The reversal of 129133909 is 909331921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78411025 + 50722884 = 8855^2 + 7122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129133909 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 (129133903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64566954 + 64566955.

It is an arithmetic number, because the mean of its divisors is an integer number (64566955).

Almost surely, 2^129133909 is an apocalyptic number.

It is an amenable number.

129133909 is a deficient number, since it is larger than the sum of its proper divisors (1).

129133909 is an equidigital number, since it uses as much as digits as its factorization.

129133909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 129133909 is about 11363.7101775784. The cubic root of 129133909 is about 505.4522093914.

The spelling of 129133909 in words is "one hundred twenty-nine million, one hundred thirty-three thousand, nine hundred nine".