51745 has 8 divisors (see below), whose sum is σ = 63360. Its totient is φ = 40560.

The previous prime is 51721. The next prime is 51749. The reversal of 51745 is 54715.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51745 - 2⁵ = 51713 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (51749) 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, 330 + ... + 460.

It is an arithmetic number, because the mean of its divisors is an integer number (7920).

2⁵¹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

51745 is a deficient number, since it is larger than the sum of its proper divisors (11615).

51745 is a wasteful number, since it uses less digits than its factorization.

51745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215.

The product of its digits is 700, while the sum is 22.

The square root of 51745 is about 227.4752733815. The cubic root of 51745 is about 37.2639993625.

The spelling of 51745 in words is "fifty-one thousand, seven hundred forty-five".