126559921129 has 2 divisors, whose sum is σ = 126559921130. Its totient is φ = 126559921128.

The previous prime is 126559921099. The next prime is 126559921181. The reversal of 126559921129 is 921129955621.

It is an a-pointer prime, because the next prime (126559921181) can be obtained adding 126559921129 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74417112025 + 52142809104 = 272795^2 + 228348^2 .

It is a cyclic number.

It is not a de Polignac number, because 126559921129 - 2¹⁵ = 126559888361 is a prime.

It is not a weakly prime, because it can be changed into another prime (126559321129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63279960564 + 63279960565.

It is an arithmetic number, because the mean of its divisors is an integer number (63279960565).

Almost surely, 2^126559921129 is an apocalyptic number.

It is an amenable number.

126559921129 is a deficient number, since it is larger than the sum of its proper divisors (1).

126559921129 is an equidigital number, since it uses as much as digits as its factorization.

126559921129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 52.

The spelling of 126559921129 in words is "one hundred twenty-six billion, five hundred fifty-nine million, nine hundred twenty-one thousand, one hundred twenty-nine".