99539 has 4 divisors (see below), whose sum is σ = 108600. Its totient is φ = 90480.

The previous prime is 99529. The next prime is 99551. The reversal of 99539 is 93599.

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

It is a cyclic number.

It is not a de Polignac number, because 99539 - 2⁴ = 99523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99499 and 99508.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 99539.

It is not an unprimeable number, because it can be changed into a prime (99529) 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, 4514 + ... + 4535.

It is an arithmetic number, because the mean of its divisors is an integer number (27150).

2⁹⁹⁵³⁹ is an apocalyptic number.

99539 is a deficient number, since it is larger than the sum of its proper divisors (9061).

99539 is a wasteful number, since it uses less digits than its factorization.

99539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060.

The product of its digits is 10935, while the sum is 35.

The square root of 99539 is about 315.4980190112. The cubic root of 99539 is about 46.3444527022.

It can be divided in two parts, 99 and 539, that multiplied together give a square (53361 = 231²).

The spelling of 99539 in words is "ninety-nine thousand, five hundred thirty-nine".