129138214841 has 2 divisors, whose sum is σ = 129138214842. Its totient is φ = 129138214840.

The previous prime is 129138214819. The next prime is 129138214879. The reversal of 129138214841 is 148412831921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70448307241 + 58689907600 = 265421^2 + 242260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129138214841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129138214792 and 129138214801.

It is not a weakly prime, because it can be changed into another prime (129138244841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64569107420 + 64569107421.

It is an arithmetic number, because the mean of its divisors is an integer number (64569107421).

Almost surely, 2^129138214841 is an apocalyptic number.

It is an amenable number.

129138214841 is a deficient number, since it is larger than the sum of its proper divisors (1).

129138214841 is an equidigital number, since it uses as much as digits as its factorization.

129138214841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 44.

The spelling of 129138214841 in words is "one hundred twenty-nine billion, one hundred thirty-eight million, two hundred fourteen thousand, eight hundred forty-one".