129222901 has 4 divisors (see below), whose sum is σ = 134841312. Its totient is φ = 123604492.

The previous prime is 129222893. The next prime is 129222913. The reversal of 129222901 is 109222921.

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 129222901 - 2³ = 129222893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129222901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129222001) 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, 2809171 + ... + 2809216.

It is an arithmetic number, because the mean of its divisors is an integer number (33710328).

Almost surely, 2^129222901 is an apocalyptic number.

It is an amenable number.

129222901 is a deficient number, since it is larger than the sum of its proper divisors (5618411).

129222901 is an equidigital number, since it uses as much as digits as its factorization.

129222901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5618410.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 129222901 is about 11367.6251257684. The cubic root of 129222901 is about 505.5682926997.

The spelling of 129222901 in words is "one hundred twenty-nine million, two hundred twenty-two thousand, nine hundred one".