129144289 has 4 divisors (see below), whose sum is σ = 129171456. Its totient is φ = 129117124.

The previous prime is 129144229. The next prime is 129144329. The reversal of 129144289 is 982441921.

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 129144289 - 2⁷ = 129144161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129144209) 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, 4369 + ... + 16654.

It is an arithmetic number, because the mean of its divisors is an integer number (32292864).

Almost surely, 2^129144289 is an apocalyptic number.

It is an amenable number.

129144289 is a deficient number, since it is larger than the sum of its proper divisors (27167).

129144289 is an equidigital number, since it uses as much as digits as its factorization.

129144289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27166.

The product of its digits is 41472, while the sum is 40.

The square root of 129144289 is about 11364.1668854342. The cubic root of 129144289 is about 505.4657520604.

The spelling of 129144289 in words is "one hundred twenty-nine million, one hundred forty-four thousand, two hundred eighty-nine".