87109 has 4 divisors (see below), whose sum is σ = 95040. Its totient is φ = 79180.

The previous prime is 87107. The next prime is 87119. The reversal of 87109 is 90178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87109 - 2¹ = 87107 is a prime.

87109 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3949 + ... + 3970.

It is an arithmetic number, because the mean of its divisors is an integer number (23760).

2⁸⁷¹⁰⁹ is an apocalyptic number.

It is an amenable number.

87109 is a deficient number, since it is larger than the sum of its proper divisors (7931).

87109 is a wasteful number, since it uses less digits than its factorization.

87109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7930.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 87109 is about 295.1423385419. The cubic root of 87109 is about 44.3289736355.

It can be divided in two parts, 87 and 109, that added together give a square (196 = 14²).

The spelling of 87109 in words is "eighty-seven thousand, one hundred nine".