165441217 has 2 divisors, whose sum is σ = 165441218. Its totient is φ = 165441216.

The previous prime is 165441197. The next prime is 165441223. The reversal of 165441217 is 712144561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155650576 + 9790641 = 12476^2 + 3129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165441217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165441257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82720608 + 82720609.

It is an arithmetic number, because the mean of its divisors is an integer number (82720609).

Almost surely, 2^165441217 is an apocalyptic number.

It is an amenable number.

165441217 is a deficient number, since it is larger than the sum of its proper divisors (1).

165441217 is an equidigital number, since it uses as much as digits as its factorization.

165441217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 165441217 is about 12862.3954611884. The cubic root of 165441217 is about 548.9691069684.

Adding to 165441217 its reverse (712144561), we get a palindrome (877585778).

The spelling of 165441217 in words is "one hundred sixty-five million, four hundred forty-one thousand, two hundred seventeen".