665141 has 2 divisors, whose sum is σ = 665142. Its totient is φ = 665140.

The previous prime is 665131. The next prime is 665153. The reversal of 665141 is 141566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600625 + 64516 = 775^2 + 254^2 .

It is a cyclic number.

It is not a de Polignac number, because 665141 - 2¹⁰ = 664117 is a prime.

It is a Chen prime.

It is equal to p₅₃₉₆₀ and since 665141 and 53960 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332570 + 332571.

It is an arithmetic number, because the mean of its divisors is an integer number (332571).

2⁶⁶⁵¹⁴¹ is an apocalyptic number.

It is an amenable number.

665141 is a deficient number, since it is larger than the sum of its proper divisors (1).

665141 is an equidigital number, since it uses as much as digits as its factorization.

665141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 665141 is about 815.5617695797. The cubic root of 665141 is about 87.2913559442.

It can be divided in two parts, 6651 and 41, that multiplied together give a triangular number (272691 = T₇₃₈).

The spelling of 665141 in words is "six hundred sixty-five thousand, one hundred forty-one".