51187 has 4 divisors (see below), whose sum is σ = 54216. Its totient is φ = 48160.

The previous prime is 51169. The next prime is 51193. The reversal of 51187 is 78115.

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

It is a cyclic number.

It is not a de Polignac number, because 51187 - 2⁷ = 51059 is a prime.

It is a Duffinian number.

51187 is a lucky number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (51137) 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 in 3 ways as a sum of consecutive naturals, for example, 1489 + ... + 1522.

It is an arithmetic number, because the mean of its divisors is an integer number (13554).

2⁵¹¹⁸⁷ is an apocalyptic number.

51187 is a deficient number, since it is larger than the sum of its proper divisors (3029).

51187 is a wasteful number, since it uses less digits than its factorization.

51187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028.

The product of its digits is 280, while the sum is 22.

The square root of 51187 is about 226.2454419430. The cubic root of 51187 is about 37.1295676604.

The spelling of 51187 in words is "fifty-one thousand, one hundred eighty-seven".