51655 has 4 divisors (see below), whose sum is σ = 61992. Its totient is φ = 41320.

The previous prime is 51647. The next prime is 51659. The reversal of 51655 is 55615.

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

It is not a de Polignac number, because 51655 - 2³ = 51647 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5161 + ... + 5170.

It is an arithmetic number, because the mean of its divisors is an integer number (15498).

2⁵¹⁶⁵⁵ is an apocalyptic number.

51655 is a deficient number, since it is larger than the sum of its proper divisors (10337).

51655 is a wasteful number, since it uses less digits than its factorization.

51655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10336.

The product of its digits is 750, while the sum is 22.

The square root of 51655 is about 227.2773635891. The cubic root of 51655 is about 37.2423824190.

Subtracting from 51655 its product of digits (750), we obtain a palindrome (50905).

The spelling of 51655 in words is "fifty-one thousand, six hundred fifty-five".