129126385819 has 2 divisors, whose sum is σ = 129126385820. Its totient is φ = 129126385818.

The previous prime is 129126385799. The next prime is 129126385909. The reversal of 129126385819 is 918583621921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129126385819 - 2⁷ = 129126385691 is a prime.

It is a super-2 number, since 2×129126385819² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129126385819.

It is not a weakly prime, because it can be changed into another prime (129126380819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64563192909 + 64563192910.

It is an arithmetic number, because the mean of its divisors is an integer number (64563192910).

Almost surely, 2^129126385819 is an apocalyptic number.

129126385819 is a deficient number, since it is larger than the sum of its proper divisors (1).

129126385819 is an equidigital number, since it uses as much as digits as its factorization.

129126385819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 55.

The spelling of 129126385819 in words is "one hundred twenty-nine billion, one hundred twenty-six million, three hundred eighty-five thousand, eight hundred nineteen".