129905438501 has 2 divisors, whose sum is σ = 129905438502. Its totient is φ = 129905438500.

The previous prime is 129905438497. The next prime is 129905438513. The reversal of 129905438501 is 105834509921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105007754401 + 24897684100 = 324049^2 + 157790^2 .

It is a cyclic number.

It is not a de Polignac number, because 129905438501 - 2² = 129905438497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129905438521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64952719250 + 64952719251.

It is an arithmetic number, because the mean of its divisors is an integer number (64952719251).

Almost surely, 2^129905438501 is an apocalyptic number.

It is an amenable number.

129905438501 is a deficient number, since it is larger than the sum of its proper divisors (1).

129905438501 is an equidigital number, since it uses as much as digits as its factorization.

129905438501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 129905438501 in words is "one hundred twenty-nine billion, nine hundred five million, four hundred thirty-eight thousand, five hundred one".