129224665 has 4 divisors (see below), whose sum is σ = 155069604. Its totient is φ = 103379728.

The previous prime is 129224651. The next prime is 129224677. The reversal of 129224665 is 566422921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566422921 = 127 ⋅4460023.

It can be written as a sum of positive squares in 2 ways, for example, as 53934336 + 75290329 = 7344^2 + 8677^2 .

It is a cyclic number.

It is not a de Polignac number, because 129224665 - 2⁹ = 129224153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12922462 + ... + 12922471.

It is an arithmetic number, because the mean of its divisors is an integer number (38767401).

Almost surely, 2^129224665 is an apocalyptic number.

It is an amenable number.

129224665 is a deficient number, since it is larger than the sum of its proper divisors (25844939).

129224665 is an equidigital number, since it uses as much as digits as its factorization.

129224665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25844938.

The product of its digits is 51840, while the sum is 37.

The square root of 129224665 is about 11367.7027142691. The cubic root of 129224665 is about 505.5705931650.

The spelling of 129224665 in words is "one hundred twenty-nine million, two hundred twenty-four thousand, six hundred sixty-five".