51641 has 4 divisors (see below), whose sum is σ = 52212. Its totient is φ = 51072.

The previous prime is 51637. The next prime is 51647. The reversal of 51641 is 14615.

It is a happy number.

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 can be written as a sum of positive squares in 2 ways, for example, as 19600 + 32041 = 140^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 51641 - 2² = 51637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51647) 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, 116 + ... + 341.

It is an arithmetic number, because the mean of its divisors is an integer number (13053).

2⁵¹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

51641 is a deficient number, since it is larger than the sum of its proper divisors (571).

51641 is a wasteful number, since it uses less digits than its factorization.

51641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570.

The product of its digits is 120, while the sum is 17.

The square root of 51641 is about 227.2465621302. The cubic root of 51641 is about 37.2390175272.

The spelling of 51641 in words is "fifty-one thousand, six hundred forty-one".