51216382 has 16 divisors (see below), whose sum is σ = 87892992. Its totient is φ = 21926520.

The previous prime is 51216367. The next prime is 51216401. The reversal of 51216382 is 28361215.

It is a self number, because there is not a number n which added to its sum of digits gives 51216382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21007 + ... + 23317.

It is an arithmetic number, because the mean of its divisors is an integer number (5493312).

Almost surely, 2^51216382 is an apocalyptic number.

51216382 is a deficient number, since it is larger than the sum of its proper divisors (36676610).

51216382 is a wasteful number, since it uses less digits than its factorization.

51216382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903.

The product of its digits is 2880, while the sum is 28.

The square root of 51216382 is about 7156.5621634972. The cubic root of 51216382 is about 371.3667058557.

Adding to 51216382 its reverse (28361215), we get a palindrome (79577597).

The spelling of 51216382 in words is "fifty-one million, two hundred sixteen thousand, three hundred eighty-two".