129376811 has 2 divisors, whose sum is σ = 129376812. Its totient is φ = 129376810.

The previous prime is 129376777. The next prime is 129376813. The reversal of 129376811 is 118673921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129376811 - 2⁶ = 129376747 is a prime.

Together with 129376813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129376813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64688405 + 64688406.

It is an arithmetic number, because the mean of its divisors is an integer number (64688406).

Almost surely, 2^129376811 is an apocalyptic number.

129376811 is a deficient number, since it is larger than the sum of its proper divisors (1).

129376811 is an equidigital number, since it uses as much as digits as its factorization.

129376811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 129376811 is about 11374.3927750012. The cubic root of 129376811 is about 505.7689308819.

The spelling of 129376811 in words is "one hundred twenty-nine million, three hundred seventy-six thousand, eight hundred eleven".