87851 has 4 divisors (see below), whose sum is σ = 89400. Its totient is φ = 86304.

The previous prime is 87833. The next prime is 87853. The reversal of 87851 is 15878.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87851 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 87851.

It is not an unprimeable number, because it can be changed into a prime (87853) 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, 686 + ... + 803.

It is an arithmetic number, because the mean of its divisors is an integer number (22350).

2⁸⁷⁸⁵¹ is an apocalyptic number.

87851 is a deficient number, since it is larger than the sum of its proper divisors (1549).

87851 is a wasteful number, since it uses less digits than its factorization.

87851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548.

The product of its digits is 2240, while the sum is 29.

The square root of 87851 is about 296.3966936388. The cubic root of 87851 is about 44.4544836118.

It can be divided in two parts, 878 and 51, that added together give a palindrome (929).

The spelling of 87851 in words is "eighty-seven thousand, eight hundred fifty-one".