129515819989 has 2 divisors, whose sum is σ = 129515819990. Its totient is φ = 129515819988.

The previous prime is 129515819981. The next prime is 129515820041. The reversal of 129515819989 is 989918515921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95501395089 + 34014424900 = 309033^2 + 184430^2 .

It is a cyclic number.

It is not a de Polignac number, because 129515819989 - 2³ = 129515819981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129515819981) 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, 64757909994 + 64757909995.

It is an arithmetic number, because the mean of its divisors is an integer number (64757909995).

Almost surely, 2^129515819989 is an apocalyptic number.

It is an amenable number.

129515819989 is a deficient number, since it is larger than the sum of its proper divisors (1).

129515819989 is an equidigital number, since it uses as much as digits as its factorization.

129515819989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20995200, while the sum is 67.

The spelling of 129515819989 in words is "one hundred twenty-nine billion, five hundred fifteen million, eight hundred nineteen thousand, nine hundred eighty-nine".