51218622 has 96 divisors (see below), whose sum is σ = 142682400. Its totient is φ = 13499136.

The previous prime is 51218597. The next prime is 51218659. The reversal of 51218622 is 22681215.

It is a happy number.

51218622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×51218622³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 47 ways as a sum of consecutive naturals, for example, 33654 + ... + 35142.

It is an arithmetic number, because the mean of its divisors is an integer number (1486275).

Almost surely, 2^51218622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51218622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71341200).

51218622 is an abundant number, since it is smaller than the sum of its proper divisors (91463778).

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

51218622 is a wasteful number, since it uses less digits than its factorization.

51218622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527 (or 1514 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 51218622 is about 7156.7186615096. The cubic root of 51218622 is about 371.3721198089.

Adding to 51218622 its reverse (22681215), we get a palindrome (73899837).

The spelling of 51218622 in words is "fifty-one million, two hundred eighteen thousand, six hundred twenty-two".