51440222 has 16 divisors (see below), whose sum is σ = 79833600. Its totient is φ = 24832920.

The previous prime is 51440203. The next prime is 51440237. The reversal of 51440222 is 22204415.

It is a happy number.

51440222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51440194 and 51440203.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 40229 + ... + 41487.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^51440222 is an apocalyptic number.

51440222 is a deficient number, since it is larger than the sum of its proper divisors (28393378).

51440222 is a wasteful number, since it uses less digits than its factorization.

51440222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1951.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 51440222 is about 7172.1839072907. The cubic root of 51440222 is about 371.9069360987.

Adding to 51440222 its reverse (22204415), we get a palindrome (73644637).

The spelling of 51440222 in words is "fifty-one million, four hundred forty thousand, two hundred twenty-two".