87539 has 2 divisors, whose sum is σ = 87540. Its totient is φ = 87538.

The previous prime is 87523. The next prime is 87541. The reversal of 87539 is 93578.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87539 - 2⁴ = 87523 is a prime.

It is a Sophie Germain prime.

Together with 87541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87509) 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 as a sum of consecutive naturals, namely, 43769 + 43770.

It is an arithmetic number, because the mean of its divisors is an integer number (43770).

2⁸⁷⁵³⁹ is an apocalyptic number.

87539 is a deficient number, since it is larger than the sum of its proper divisors (1).

87539 is an equidigital number, since it uses as much as digits as its factorization.

87539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 87539 is about 295.8699038429. The cubic root of 87539 is about 44.4017949657.

Adding to 87539 its sum of digits (32), we get a triangular number (87571 = T₄₁₈).

It can be divided in two parts, 87 and 539, that added together give a palindrome (626).

The spelling of 87539 in words is "eighty-seven thousand, five hundred thirty-nine".