129207829 has 2 divisors, whose sum is σ = 129207830. Its totient is φ = 129207828.

The previous prime is 129207823. The next prime is 129207833. The reversal of 129207829 is 928702921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93566929 + 35640900 = 9673^2 + 5970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129207829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129207791 and 129207800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129207823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64603914 + 64603915.

It is an arithmetic number, because the mean of its divisors is an integer number (64603915).

Almost surely, 2^129207829 is an apocalyptic number.

It is an amenable number.

129207829 is a deficient number, since it is larger than the sum of its proper divisors (1).

129207829 is an equidigital number, since it uses as much as digits as its factorization.

129207829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 129207829 is about 11366.9621711344. The cubic root of 129207829 is about 505.5486361695.

The spelling of 129207829 in words is "one hundred twenty-nine million, two hundred seven thousand, eight hundred twenty-nine".