129489875809 has 4 divisors (see below), whose sum is σ = 147988429504. Its totient is φ = 110991322116.

The previous prime is 129489875747. The next prime is 129489875843. The reversal of 129489875809 is 908578984921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129489875809 - 2⁷ = 129489875681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129489873809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9249276837 + ... + 9249276850.

It is an arithmetic number, because the mean of its divisors is an integer number (36997107376).

Almost surely, 2^129489875809 is an apocalyptic number.

It is an amenable number.

129489875809 is a deficient number, since it is larger than the sum of its proper divisors (18498553695).

129489875809 is an equidigital number, since it uses as much as digits as its factorization.

129489875809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18498553694.

The product of its (nonzero) digits is 104509440, while the sum is 70.

The spelling of 129489875809 in words is "one hundred twenty-nine billion, four hundred eighty-nine million, eight hundred seventy-five thousand, eight hundred nine".