51442222 has 16 divisors (see below), whose sum is σ = 83501712. Its totient is φ = 23627520.

The previous prime is 51442219. The next prime is 51442243. The reversal of 51442222 is 22224415.

It is a junction number, because it is equal to n+sod(n) for n = 51442193 and 51442202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798 + ... + 10174.

It is an arithmetic number, because the mean of its divisors is an integer number (5218857).

Almost surely, 2^51442222 is an apocalyptic number.

51442222 is a deficient number, since it is larger than the sum of its proper divisors (32059490).

51442222 is a wasteful number, since it uses less digits than its factorization.

51442222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9603.

The product of its digits is 1280, while the sum is 22.

The square root of 51442222 is about 7172.3233334813. The cubic root of 51442222 is about 371.9117559602.

Adding to 51442222 its reverse (22224415), we get a palindrome (73666637).

The spelling of 51442222 in words is "fifty-one million, four hundred forty-two thousand, two hundred twenty-two".