129227929 has 4 divisors (see below), whose sum is σ = 130784976. Its totient is φ = 127670884.

The previous prime is 129227927. The next prime is 129227947. The reversal of 129227929 is 929722921.

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: 929722921 = 6659 ⋅139619.

It is a cyclic number.

It is not a de Polignac number, because 129227929 - 2¹ = 129227927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129227921) 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, 778399 + ... + 778564.

It is an arithmetic number, because the mean of its divisors is an integer number (32696244).

Almost surely, 2^129227929 is an apocalyptic number.

It is an amenable number.

129227929 is a deficient number, since it is larger than the sum of its proper divisors (1557047).

129227929 is an equidigital number, since it uses as much as digits as its factorization.

129227929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557046.

The product of its digits is 81648, while the sum is 43.

The square root of 129227929 is about 11367.8462779895. The cubic root of 129227929 is about 505.5748497532.

The spelling of 129227929 in words is "one hundred twenty-nine million, two hundred twenty-seven thousand, nine hundred twenty-nine".