665241 has 4 divisors (see below), whose sum is σ = 886992. Its totient is φ = 443492.

The previous prime is 665239. The next prime is 665251. The reversal of 665241 is 142566.

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.

It is a cyclic number.

It is not a de Polignac number, because 665241 - 2¹ = 665239 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (665201) 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, 110871 + ... + 110876.

It is an arithmetic number, because the mean of its divisors is an integer number (221748).

2⁶⁶⁵²⁴¹ is an apocalyptic number.

It is an amenable number.

665241 is a deficient number, since it is larger than the sum of its proper divisors (221751).

665241 is a wasteful number, since it uses less digits than its factorization.

665241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221750.

The product of its digits is 1440, while the sum is 24.

The square root of 665241 is about 815.6230747104. The cubic root of 665241 is about 87.2957303040.

The spelling of 665241 in words is "six hundred sixty-five thousand, two hundred forty-one".