51439222 has 4 divisors (see below), whose sum is σ = 77158836. Its totient is φ = 25719610.

The previous prime is 51439217. The next prime is 51439249. The reversal of 51439222 is 22293415.

51439222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 12859804 + ... + 12859807.

It is an arithmetic number, because the mean of its divisors is an integer number (19289709).

Almost surely, 2^51439222 is an apocalyptic number.

51439222 is a deficient number, since it is larger than the sum of its proper divisors (25719614).

51439222 is a wasteful number, since it uses less digits than its factorization.

51439222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25719613.

The product of its digits is 4320, while the sum is 28.

The square root of 51439222 is about 7172.1141931790. The cubic root of 51439222 is about 371.9045261211.

It can be divided in two parts, 5143 and 9222, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 51439222 in words is "fifty-one million, four hundred thirty-nine thousand, two hundred twenty-two".