51812 has 6 divisors (see below), whose sum is σ = 90678. Its totient is φ = 25904.

The previous prime is 51803. The next prime is 51817. The reversal of 51812 is 21815.

It can be written as a sum of positive squares in only one way, i.e., 33856 + 17956 = 184^2 + 134^2 .

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51812.

It is not an unprimeable number, because it can be changed into a prime (51817) by changing a digit.

51812 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6473 + ... + 6480.

It is an arithmetic number, because the mean of its divisors is an integer number (15113).

2⁵¹⁸¹² is an apocalyptic number.

It is an amenable number.

51812 is a deficient number, since it is larger than the sum of its proper divisors (38866).

51812 is a wasteful number, since it uses less digits than its factorization.

51812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12957 (or 12955 counting only the distinct ones).

The product of its digits is 80, while the sum is 17.

The square root of 51812 is about 227.6224944947. The cubic root of 51812 is about 37.2800757058.

It can be divided in two parts, 518 and 12, that multiplied together give a triangular number (6216 = T₁₁₁).

The spelling of 51812 in words is "fifty-one thousand, eight hundred twelve".