129021959 has 8 divisors (see below), whose sum is σ = 149030928. Its totient is φ = 110392960.

The previous prime is 129021953. The next prime is 129021961. The reversal of 129021959 is 959120921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129021959 - 2⁴ = 129021943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129021953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344792 + ... + 345165.

It is an arithmetic number, because the mean of its divisors is an integer number (18628866).

Almost surely, 2^129021959 is an apocalyptic number.

129021959 is a deficient number, since it is larger than the sum of its proper divisors (20008969).

129021959 is a wasteful number, since it uses less digits than its factorization.

129021959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689985.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 129021959 is about 11358.7833415379. The cubic root of 129021959 is about 505.3061033453.

The spelling of 129021959 in words is "one hundred twenty-nine million, twenty-one thousand, nine hundred fifty-nine".