51387222 has 8 divisors (see below), whose sum is σ = 102774456. Its totient is φ = 17129072.

The previous prime is 51387179. The next prime is 51387233. The reversal of 51387222 is 22278315.

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

51387222 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 51387222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4282263 + ... + 4282274.

It is an arithmetic number, because the mean of its divisors is an integer number (12846807).

Almost surely, 2^51387222 is an apocalyptic number.

51387222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51387222 is a wasteful number, since it uses less digits than its factorization.

51387222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8564542.

The product of its digits is 6720, while the sum is 30.

The square root of 51387222 is about 7168.4881251209. The cubic root of 51387222 is about 371.7791642222.

The spelling of 51387222 in words is "fifty-one million, three hundred eighty-seven thousand, two hundred twenty-two".