51671 has 4 divisors (see below), whose sum is σ = 52152. Its totient is φ = 51192.

The previous prime is 51659. The next prime is 51673. The reversal of 51671 is 17615.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51671 - 2⁶ = 51607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51673) 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, 5 + ... + 321.

It is an arithmetic number, because the mean of its divisors is an integer number (13038).

2⁵¹⁶⁷¹ is an apocalyptic number.

51671 is a deficient number, since it is larger than the sum of its proper divisors (481).

51671 is a wasteful number, since it uses less digits than its factorization.

51671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

The product of its digits is 210, while the sum is 20.

The square root of 51671 is about 227.3125601457. The cubic root of 51671 is about 37.2462272653.

The spelling of 51671 in words is "fifty-one thousand, six hundred seventy-one".