129448243817 has 2 divisors, whose sum is σ = 129448243818. Its totient is φ = 129448243816.

The previous prime is 129448243781. The next prime is 129448243849. The reversal of 129448243817 is 718342844921.

Together with previous prime (129448243781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73265496976 + 56182746841 = 270676^2 + 237029^2 .

It is a cyclic number.

It is not a de Polignac number, because 129448243817 - 2¹² = 129448239721 is a prime.

It is not a weakly prime, because it can be changed into another prime (129448243117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64724121908 + 64724121909.

It is an arithmetic number, because the mean of its divisors is an integer number (64724121909).

Almost surely, 2^129448243817 is an apocalyptic number.

It is an amenable number.

129448243817 is a deficient number, since it is larger than the sum of its proper divisors (1).

129448243817 is an equidigital number, since it uses as much as digits as its factorization.

129448243817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3096576, while the sum is 53.

The spelling of 129448243817 in words is "one hundred twenty-nine billion, four hundred forty-eight million, two hundred forty-three thousand, eight hundred seventeen".