129969911 has 2 divisors, whose sum is σ = 129969912. Its totient is φ = 129969910.

The previous prime is 129969893. The next prime is 129969919. The reversal of 129969911 is 119969921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129969911 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 (129969919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64984955 + 64984956.

It is an arithmetic number, because the mean of its divisors is an integer number (64984956).

Almost surely, 2^129969911 is an apocalyptic number.

129969911 is a deficient number, since it is larger than the sum of its proper divisors (1).

129969911 is an equidigital number, since it uses as much as digits as its factorization.

129969911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 47.

The square root of 129969911 is about 11400.4346846951. The cubic root of 129969911 is about 506.5406156209.

The spelling of 129969911 in words is "one hundred twenty-nine million, nine hundred sixty-nine thousand, nine hundred eleven".