51222115 has 24 divisors (see below), whose sum is σ = 71735328. Its totient is φ = 34394880.

The previous prime is 51222113. The next prime is 51222121. The reversal of 51222115 is 51122215.

51222115 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 51222115 - 2¹ = 51222113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51222092 and 51222101.

It is not an unprimeable number, because it can be changed into a prime (51222113) 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 23 ways as a sum of consecutive naturals, for example, 98055 + ... + 98575.

It is an arithmetic number, because the mean of its divisors is an integer number (2988972).

Almost surely, 2^51222115 is an apocalyptic number.

51222115 is a deficient number, since it is larger than the sum of its proper divisors (20513213).

51222115 is an equidigital number, since it uses as much as digits as its factorization.

51222115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 586 counting only the distinct ones).

The product of its digits is 200, while the sum is 19.

The square root of 51222115 is about 7156.9626937689. The cubic root of 51222115 is about 371.3805618773.

The spelling of 51222115 in words is "fifty-one million, two hundred twenty-two thousand, one hundred fifteen".