51123 has 4 divisors (see below), whose sum is σ = 68168. Its totient is φ = 34080.

The previous prime is 51109. The next prime is 51131. The reversal of 51123 is 32115.

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

It is not a de Polignac number, because 51123 - 2⁶ = 51059 is a prime.

It is a super-2 number, since 2×51123² = 5227122258, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51099 and 51108.

It is not an unprimeable number, because it can be changed into a prime (51133) 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, 8518 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (17042).

2⁵¹¹²³ is an apocalyptic number.

51123 is a deficient number, since it is larger than the sum of its proper divisors (17045).

51123 is a wasteful number, since it uses less digits than its factorization.

51123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17044.

The product of its digits is 30, while the sum is 12.

The square root of 51123 is about 226.1039583908. The cubic root of 51123 is about 37.1140866243.

Adding to 51123 its reverse (32115), we get a palindrome (83238).

It can be divided in two parts, 5112 and 3, that added together give a palindrome (5115).

The spelling of 51123 in words is "fifty-one thousand, one hundred twenty-three".