245165 has 4 divisors (see below), whose sum is σ = 294204. Its totient is φ = 196128.

The previous prime is 245149. The next prime is 245171. The reversal of 245165 is 561542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561542 = 2 ⋅280771.

It can be written as a sum of positive squares in 2 ways, for example, as 67081 + 178084 = 259^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 245165 - 2⁴ = 245149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 245165.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24512 + ... + 24521.

It is an arithmetic number, because the mean of its divisors is an integer number (73551).

2²⁴⁵¹⁶⁵ is an apocalyptic number.

It is an amenable number.

245165 is a deficient number, since it is larger than the sum of its proper divisors (49039).

245165 is an equidigital number, since it uses as much as digits as its factorization.

245165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49038.

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

The square root of 245165 is about 495.1413939472. The cubic root of 245165 is about 62.5872913601.

The spelling of 245165 in words is "two hundred forty-five thousand, one hundred sixty-five".