51888221 has 32 divisors (see below), whose sum is σ = 70502400. Its totient is φ = 36953280.

The previous prime is 51888209. The next prime is 51888223. The reversal of 51888221 is 12288815.

51888221 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 51888221 - 2¹⁴ = 51871837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51888223) 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 31 ways as a sum of consecutive naturals, for example, 41816 + ... + 43038.

It is an arithmetic number, because the mean of its divisors is an integer number (2203200).

Almost surely, 2^51888221 is an apocalyptic number.

It is an amenable number.

51888221 is a deficient number, since it is larger than the sum of its proper divisors (18614179).

51888221 is a wasteful number, since it uses less digits than its factorization.

51888221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289.

The product of its digits is 10240, while the sum is 35.

The square root of 51888221 is about 7203.3479021910. The cubic root of 51888221 is about 372.9834774311.

The spelling of 51888221 in words is "fifty-one million, eight hundred eighty-eight thousand, two hundred twenty-one".