129438791 has 2 divisors, whose sum is σ = 129438792. Its totient is φ = 129438790.

The previous prime is 129438787. The next prime is 129438847. The reversal of 129438791 is 197834921.

It is a weak prime.

It is an emirp because it is prime and its reverse (197834921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129438791 - 2² = 129438787 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 (129438091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64719395 + 64719396.

It is an arithmetic number, because the mean of its divisors is an integer number (64719396).

Almost surely, 2^129438791 is an apocalyptic number.

129438791 is a deficient number, since it is larger than the sum of its proper divisors (1).

129438791 is an equidigital number, since it uses as much as digits as its factorization.

129438791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 129438791 is about 11377.1169898178. The cubic root of 129438791 is about 505.8496835134.

The spelling of 129438791 in words is "one hundred twenty-nine million, four hundred thirty-eight thousand, seven hundred ninety-one".