51087 has 4 divisors (see below), whose sum is σ = 68120. Its totient is φ = 34056.

The previous prime is 51071. The next prime is 51109. The reversal of 51087 is 78015.

It is a happy number.

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

It is not a de Polignac number, because 51087 - 2⁴ = 51071 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 51087.

It is not an unprimeable number, because it can be changed into a prime (51047) 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, 8512 + ... + 8517.

It is an arithmetic number, because the mean of its divisors is an integer number (17030).

2⁵¹⁰⁸⁷ is an apocalyptic number.

51087 is a deficient number, since it is larger than the sum of its proper divisors (17033).

51087 is a wasteful number, since it uses less digits than its factorization.

51087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17032.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 51087 is about 226.0243349730. The cubic root of 51087 is about 37.1053728629.

It can be divided in two parts, 5108 and 7, that added together give a palindrome (5115).

The spelling of 51087 in words is "fifty-one thousand, eighty-seven".