51523 has 4 divisors (see below), whose sum is σ = 52360. Its totient is φ = 50688.

The previous prime is 51521. The next prime is 51539. The reversal of 51523 is 32515.

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

It is a cyclic number.

It is not a de Polignac number, because 51523 - 2¹ = 51521 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 51497 and 51506.

It is not an unprimeable number, because it can be changed into a prime (51521) 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 in 3 ways as a sum of consecutive naturals, for example, 318 + ... + 451.

It is an arithmetic number, because the mean of its divisors is an integer number (13090).

2⁵¹⁵²³ is an apocalyptic number.

51523 is a deficient number, since it is larger than the sum of its proper divisors (837).

51523 is an equidigital number, since it uses as much as digits as its factorization.

51523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836.

The product of its digits is 150, while the sum is 16.

The square root of 51523 is about 226.9867837562. The cubic root of 51523 is about 37.2106321018.

The spelling of 51523 in words is "fifty-one thousand, five hundred twenty-three".