51445222 has 8 divisors (see below), whose sum is σ = 77232096. Its totient is φ = 25701192.

The previous prime is 51445193. The next prime is 51445223. The reversal of 51445222 is 22254415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51445222² = 5293221733258568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51445223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7518 + ... + 12625.

It is an arithmetic number, because the mean of its divisors is an integer number (9654012).

Almost surely, 2^51445222 is an apocalyptic number.

51445222 is a deficient number, since it is larger than the sum of its proper divisors (25786874).

51445222 is a wasteful number, since it uses less digits than its factorization.

51445222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21422.

The product of its digits is 3200, while the sum is 25.

The square root of 51445222 is about 7172.5324676853. The cubic root of 51445222 is about 371.9189855182.

Adding to 51445222 its reverse (22254415), we get a palindrome (73699637).

The spelling of 51445222 in words is "fifty-one million, four hundred forty-five thousand, two hundred twenty-two".