129320051 has 4 divisors (see below), whose sum is σ = 147794352. Its totient is φ = 110845752.

The previous prime is 129320047. The next prime is 129320063. The reversal of 129320051 is 150023921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129320051 - 2² = 129320047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129319999 and 129320026.

It is not an unprimeable number, because it can be changed into a prime (129320021) 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, 9237140 + ... + 9237153.

It is an arithmetic number, because the mean of its divisors is an integer number (36948588).

Almost surely, 2^129320051 is an apocalyptic number.

129320051 is a deficient number, since it is larger than the sum of its proper divisors (18474301).

129320051 is an equidigital number, since it uses as much as digits as its factorization.

129320051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18474300.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 129320051 is about 11371.8974230337. The cubic root of 129320051 is about 505.6949566680.

Adding to 129320051 its reverse (150023921), we get a palindrome (279343972).

The spelling of 129320051 in words is "one hundred twenty-nine million, three hundred twenty thousand, fifty-one".