51222129 has 16 divisors (see below), whose sum is σ = 79124352. Its totient is φ = 28867968.

The previous prime is 51222121. The next prime is 51222163. The reversal of 51222129 is 92122215.

51222129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51222129 - 2³ = 51222121 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51222099 and 51222108.

It is not an unprimeable number, because it can be changed into a prime (51222121) 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 15 ways as a sum of consecutive naturals, for example, 15174 + ... + 18239.

It is an arithmetic number, because the mean of its divisors is an integer number (4945272).

Almost surely, 2^51222129 is an apocalyptic number.

It is an amenable number.

51222129 is a deficient number, since it is larger than the sum of its proper divisors (27902223).

51222129 is a wasteful number, since it uses less digits than its factorization.

51222129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33496.

The product of its digits is 720, while the sum is 24.

The square root of 51222129 is about 7156.9636718374. The cubic root of 51222129 is about 371.3805957125.

The spelling of 51222129 in words is "fifty-one million, two hundred twenty-two thousand, one hundred twenty-nine".