51651 has 8 divisors (see below), whose sum is σ = 76560. Its totient is φ = 34416.

The previous prime is 51647. The next prime is 51659. The reversal of 51651 is 15615.

51651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51651 - 2² = 51647 is a prime.

51651 is a lucky number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (51659) 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, 930 + ... + 983.

It is an arithmetic number, because the mean of its divisors is an integer number (9570).

2⁵¹⁶⁵¹ is an apocalyptic number.

51651 is a deficient number, since it is larger than the sum of its proper divisors (24909).

51651 is a wasteful number, since it uses less digits than its factorization.

51651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1916 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 51651 is about 227.2685635982. The cubic root of 51651 is about 37.2414210834.

The spelling of 51651 in words is "fifty-one thousand, six hundred fifty-one".