51286 has 4 divisors (see below), whose sum is σ = 76932. Its totient is φ = 25642.

The previous prime is 51283. The next prime is 51287. The reversal of 51286 is 68215.

It is a happy number.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51283) by changing a digit.

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, 12820 + ... + 12823.

It is an arithmetic number, because the mean of its divisors is an integer number (19233).

2⁵¹²⁸⁶ is an apocalyptic number.

51286 is a deficient number, since it is larger than the sum of its proper divisors (25646).

51286 is a wasteful number, since it uses less digits than its factorization.

51286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25645.

The product of its digits is 480, while the sum is 22.

The square root of 51286 is about 226.4641251943. The cubic root of 51286 is about 37.1534894893.

The spelling of 51286 in words is "fifty-one thousand, two hundred eighty-six".