51166 has 4 divisors (see below), whose sum is σ = 76752. Its totient is φ = 25582.

The previous prime is 51157. The next prime is 51169. The reversal of 51166 is 66115.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12790 + ... + 12793.

It is an arithmetic number, because the mean of its divisors is an integer number (19188).

2⁵¹¹⁶⁶ is an apocalyptic number.

51166 is a deficient number, since it is larger than the sum of its proper divisors (25586).

51166 is a wasteful number, since it uses less digits than its factorization.

51166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25585.

The product of its digits is 180, while the sum is 19.

The square root of 51166 is about 226.1990274073. The cubic root of 51166 is about 37.1244893686.

The spelling of 51166 in words is "fifty-one thousand, one hundred sixty-six".