165441 has 4 divisors (see below), whose sum is σ = 220592. Its totient is φ = 110292.

The previous prime is 165437. The next prime is 165443. The reversal of 165441 is 144561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 144561 = 3 ⋅48187.

It is not a de Polignac number, because 165441 - 2² = 165437 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 165441.

It is not an unprimeable number, because it can be changed into a prime (165443) 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, 27571 + ... + 27576.

It is an arithmetic number, because the mean of its divisors is an integer number (55148).

2¹⁶⁵⁴⁴¹ is an apocalyptic number.

It is an amenable number.

165441 is a deficient number, since it is larger than the sum of its proper divisors (55151).

165441 is an equidigital number, since it uses as much as digits as its factorization.

165441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55150.

The product of its digits is 480, while the sum is 21.

The square root of 165441 is about 406.7443914795. The cubic root of 165441 is about 54.8968866951.

It can be divided in two parts, 165 and 441, that added together give a palindrome (606).

The spelling of 165441 in words is "one hundred sixty-five thousand, four hundred forty-one".