129138907 has 2 divisors, whose sum is σ = 129138908. Its totient is φ = 129138906.

The previous prime is 129138881. The next prime is 129138931. The reversal of 129138907 is 709831921.

It is a strong prime.

It is an emirp because it is prime and its reverse (709831921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129138907 - 2¹⁵ = 129106139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129138907.

It is not a weakly prime, because it can be changed into another prime (129138967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64569453 + 64569454.

It is an arithmetic number, because the mean of its divisors is an integer number (64569454).

Almost surely, 2^129138907 is an apocalyptic number.

129138907 is a deficient number, since it is larger than the sum of its proper divisors (1).

129138907 is an equidigital number, since it uses as much as digits as its factorization.

129138907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 129138907 is about 11363.9300860222. The cubic root of 129138907 is about 505.4587303163.

The spelling of 129138907 in words is "one hundred twenty-nine million, one hundred thirty-eight thousand, nine hundred seven".