129146789 has 4 divisors (see below), whose sum is σ = 129219456. Its totient is φ = 129074124.

The previous prime is 129146783. The next prime is 129146803. The reversal of 129146789 is 987641921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 987641921 = 7 ⋅141091703.

It is a cyclic number.

It is not a de Polignac number, because 129146789 - 2⁸ = 129146533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129146783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33599 + ... + 37244.

It is an arithmetic number, because the mean of its divisors is an integer number (32304864).

Almost surely, 2^129146789 is an apocalyptic number.

It is an amenable number.

129146789 is a deficient number, since it is larger than the sum of its proper divisors (72667).

129146789 is an equidigital number, since it uses as much as digits as its factorization.

129146789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72666.

The product of its digits is 217728, while the sum is 47.

The square root of 129146789 is about 11364.2768797667. The cubic root of 129146789 is about 505.4690136738.

The spelling of 129146789 in words is "one hundred twenty-nine million, one hundred forty-six thousand, seven hundred eighty-nine".