165243 has 16 divisors (see below), whose sum is σ = 250880. Its totient is φ = 95904.

The previous prime is 165233. The next prime is 165247. The reversal of 165243 is 342561.

It is a happy number.

165243 is nontrivially palindromic in base 7.

It is not a de Polignac number, because 165243 - 2⁵ = 165211 is a prime.

It is the 407-th Hogben number.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (165247) by changing a digit.

It is a nontrivial repunit in base 406.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 630 + ... + 852.

It is an arithmetic number, because the mean of its divisors is an integer number (15680).

2¹⁶⁵²⁴³ is an apocalyptic number.

165243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

165243 is a deficient number, since it is larger than the sum of its proper divisors (85637).

165243 is a wasteful number, since it uses less digits than its factorization.

165243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258.

The product of its digits is 720, while the sum is 21.

The square root of 165243 is about 406.5009225082. The cubic root of 165243 is about 54.8749777312.

The spelling of 165243 in words is "one hundred sixty-five thousand, two hundred forty-three".