129378811 has 2 divisors, whose sum is σ = 129378812. Its totient is φ = 129378810.

The previous prime is 129378803. The next prime is 129378829. The reversal of 129378811 is 118873921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129378811 - 2³ = 129378803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129378881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64689405 + 64689406.

It is an arithmetic number, because the mean of its divisors is an integer number (64689406).

Almost surely, 2^129378811 is an apocalyptic number.

129378811 is a deficient number, since it is larger than the sum of its proper divisors (1).

129378811 is an equidigital number, since it uses as much as digits as its factorization.

129378811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 129378811 is about 11374.4806914426. The cubic root of 129378811 is about 505.7715370487.

The spelling of 129378811 in words is "one hundred twenty-nine million, three hundred seventy-eight thousand, eight hundred eleven".