51558 has 16 divisors (see below), whose sum is σ = 111216. Its totient is φ = 15840.

The previous prime is 51551. The next prime is 51563. The reversal of 51558 is 85515.

51558 is nontrivially palindromic in base 5.

51558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551) 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, 253 + ... + 408.

It is an arithmetic number, because the mean of its divisors is an integer number (6951).

2⁵¹⁵⁵⁸ is an apocalyptic number.

51558 is an abundant number, since it is smaller than the sum of its proper divisors (59658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55608).

51558 is a wasteful number, since it uses less digits than its factorization.

51558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

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

The square root of 51558 is about 227.0638676672. The cubic root of 51558 is about 37.2190560247.

The spelling of 51558 in words is "fifty-one thousand, five hundred fifty-eight".