87311 has 4 divisors (see below), whose sum is σ = 99792. Its totient is φ = 74832.

The previous prime is 87299. The next prime is 87313. The reversal of 87311 is 11378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11378 = 2 ⋅5689.

It is a cyclic number.

It is not a de Polignac number, because 87311 - 2¹⁰ = 86287 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87313) 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, 6230 + ... + 6243.

It is an arithmetic number, because the mean of its divisors is an integer number (24948).

2⁸⁷³¹¹ is an apocalyptic number.

87311 is a deficient number, since it is larger than the sum of its proper divisors (12481).

87311 is a wasteful number, since it uses less digits than its factorization.

87311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12480.

The product of its digits is 168, while the sum is 20.

The square root of 87311 is about 295.4843481472. The cubic root of 87311 is about 44.3632125009.

Adding to 87311 its reverse (11378), we get a palindrome (98689).

The spelling of 87311 in words is "eighty-seven thousand, three hundred eleven".