165245 has 4 divisors (see below), whose sum is σ = 198300. Its totient is φ = 132192.

The previous prime is 165233. The next prime is 165247. The reversal of 165245 is 542561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19321 + 145924 = 139^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 165245 - 2⁴ = 165229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165247) 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, 16520 + ... + 16529.

It is an arithmetic number, because the mean of its divisors is an integer number (49575).

2¹⁶⁵²⁴⁵ is an apocalyptic number.

It is an amenable number.

165245 is a deficient number, since it is larger than the sum of its proper divisors (33055).

165245 is an equidigital number, since it uses as much as digits as its factorization.

165245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33054.

The product of its digits is 1200, while the sum is 23.

The square root of 165245 is about 406.5033825198. The cubic root of 165245 is about 54.8751991213.

The spelling of 165245 in words is "one hundred sixty-five thousand, two hundred forty-five".