165539 has 8 divisors (see below), whose sum is σ = 183600. Its totient is φ = 148000.

The previous prime is 165533. The next prime is 165541. The reversal of 165539 is 935561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165539 - 2⁴ = 165523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1037 + ... + 1185.

It is an arithmetic number, because the mean of its divisors is an integer number (22950).

2¹⁶⁵⁵³⁹ is an apocalyptic number.

165539 is a deficient number, since it is larger than the sum of its proper divisors (18061).

165539 is a wasteful number, since it uses less digits than its factorization.

165539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its digits is 4050, while the sum is 29.

The square root of 165539 is about 406.8648424231. The cubic root of 165539 is about 54.9077240590.

It can be divided in two parts, 16 and 5539, that added together give a palindrome (5555).

The spelling of 165539 in words is "one hundred sixty-five thousand, five hundred thirty-nine".