129356348521 has 2 divisors, whose sum is σ = 129356348522. Its totient is φ = 129356348520.

The previous prime is 129356348503. The next prime is 129356348533. The reversal of 129356348521 is 125843653921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129356034921 + 313600 = 359661^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 129356348521 - 2⁷ = 129356348393 is a prime.

It is not a weakly prime, because it can be changed into another prime (129356348501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64678174260 + 64678174261.

It is an arithmetic number, because the mean of its divisors is an integer number (64678174261).

Almost surely, 2^129356348521 is an apocalyptic number.

It is an amenable number.

129356348521 is a deficient number, since it is larger than the sum of its proper divisors (1).

129356348521 is an equidigital number, since it uses as much as digits as its factorization.

129356348521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 49.

The spelling of 129356348521 in words is "one hundred twenty-nine billion, three hundred fifty-six million, three hundred forty-eight thousand, five hundred twenty-one".