129138007 has 2 divisors, whose sum is σ = 129138008. Its totient is φ = 129138006.

The previous prime is 129137993. The next prime is 129138017. The reversal of 129138007 is 700831921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129138007 - 2¹⁵ = 129105239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129138007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129138017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64569003 + 64569004.

It is an arithmetic number, because the mean of its divisors is an integer number (64569004).

Almost surely, 2^129138007 is an apocalyptic number.

129138007 is a deficient number, since it is larger than the sum of its proper divisors (1).

129138007 is an equidigital number, since it uses as much as digits as its factorization.

129138007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 129138007 is about 11363.8904869767. The cubic root of 129138007 is about 505.4575560925.

Adding to 129138007 its reverse (700831921), we get a palindrome (829969928).

The spelling of 129138007 in words is "one hundred twenty-nine million, one hundred thirty-eight thousand, seven".