51855 has 8 divisors (see below), whose sum is σ = 82992. Its totient is φ = 27648.

The previous prime is 51853. The next prime is 51859. The reversal of 51855 is 55815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51855 - 2¹ = 51853 is a prime.

51855 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1714 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (10374).

2⁵¹⁸⁵⁵ is an apocalyptic number.

51855 is a deficient number, since it is larger than the sum of its proper divisors (31137).

51855 is a wasteful number, since it uses less digits than its factorization.

51855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465.

The product of its digits is 1000, while the sum is 24.

The square root of 51855 is about 227.7169295419. The cubic root of 51855 is about 37.2903860586.

The spelling of 51855 in words is "fifty-one thousand, eight hundred fifty-five".