51261222 has 32 divisors (see below), whose sum is σ = 108864000. Its totient is φ = 16035968.

The previous prime is 51261209. The next prime is 51261263. The reversal of 51261222 is 22216215.

It is a happy number.

51261222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 15 ways as a sum of consecutive naturals, for example, 60679 + ... + 61517.

It is an arithmetic number, because the mean of its divisors is an integer number (3402000).

Almost surely, 2^51261222 is an apocalyptic number.

51261222 is an abundant number, since it is smaller than the sum of its proper divisors (57602778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51261222 is a wasteful number, since it uses less digits than its factorization.

51261222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460.

The product of its digits is 480, while the sum is 21.

The square root of 51261222 is about 7159.6942672156. The cubic root of 51261222 is about 371.4750515656.

Adding to 51261222 its reverse (22216215), we get a palindrome (73477437).

The spelling of 51261222 in words is "fifty-one million, two hundred sixty-one thousand, two hundred twenty-two".