165139 has 4 divisors (see below), whose sum is σ = 177856. Its totient is φ = 152424.

The previous prime is 165133. The next prime is 165161. The reversal of 165139 is 931561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931561 = 41 ⋅22721.

It is a cyclic number.

It is not a de Polignac number, because 165139 - 2⁹ = 164627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165133) 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, 6339 + ... + 6364.

It is an arithmetic number, because the mean of its divisors is an integer number (44464).

2¹⁶⁵¹³⁹ is an apocalyptic number.

165139 is a deficient number, since it is larger than the sum of its proper divisors (12717).

165139 is a wasteful number, since it uses less digits than its factorization.

165139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12716.

The product of its digits is 810, while the sum is 25.

The square root of 165139 is about 406.3729813853. The cubic root of 165139 is about 54.8634629814.

The spelling of 165139 in words is "one hundred sixty-five thousand, one hundred thirty-nine".