51220115 has 4 divisors (see below), whose sum is σ = 61464144. Its totient is φ = 40976088.

The previous prime is 51220109. The next prime is 51220129. The reversal of 51220115 is 51102215.

51220115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51220115 - 2²⁴ = 34442899 is a prime.

It is a super-2 number, since 2×51220115² = 5247000361226450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51220093 and 51220102.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5122007 + ... + 5122016.

It is an arithmetic number, because the mean of its divisors is an integer number (15366036).

Almost surely, 2^51220115 is an apocalyptic number.

51220115 is a deficient number, since it is larger than the sum of its proper divisors (10244029).

51220115 is a wasteful number, since it uses less digits than its factorization.

51220115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10244028.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 51220115 is about 7156.8229683289. The cubic root of 51220115 is about 371.3757282178.

The spelling of 51220115 in words is "fifty-one million, two hundred twenty thousand, one hundred fifteen".