51220250 has 32 divisors (see below), whose sum is σ = 96437952. Its totient is φ = 20370000.

The previous prime is 51220223. The next prime is 51220291. The reversal of 51220250 is 5202215.

51220250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 52265 + ... + 53235.

It is an arithmetic number, because the mean of its divisors is an integer number (3013686).

Almost surely, 2^51220250 is an apocalyptic number.

51220250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51220250 is a deficient number, since it is larger than the sum of its proper divisors (45217702).

51220250 is a wasteful number, since it uses less digits than its factorization.

51220250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199 (or 1189 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 51220250 is about 7156.8323998819. The cubic root of 51220250 is about 371.3760544937.

Adding to 51220250 its reverse (5202215), we get a palindrome (56422465).

The spelling of 51220250 in words is "fifty-one million, two hundred twenty thousand, two hundred fifty".