51573 has 4 divisors (see below), whose sum is σ = 68768. Its totient is φ = 34380.

The previous prime is 51563. The next prime is 51577. The reversal of 51573 is 37515.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51573 - 2⁹ = 51061 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 9 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51577) 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, 8593 + ... + 8598.

It is an arithmetic number, because the mean of its divisors is an integer number (17192).

2⁵¹⁵⁷³ is an apocalyptic number.

It is an amenable number.

51573 is a deficient number, since it is larger than the sum of its proper divisors (17195).

51573 is a wasteful number, since it uses less digits than its factorization.

51573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17194.

The product of its digits is 525, while the sum is 21.

The square root of 51573 is about 227.0968956195. The cubic root of 51573 is about 37.2226651103. Note that the first 3 decimals are identical.

The spelling of 51573 in words is "fifty-one thousand, five hundred seventy-three".