165741217 has 2 divisors, whose sum is σ = 165741218. Its totient is φ = 165741216.

The previous prime is 165741203. The next prime is 165741227. The reversal of 165741217 is 712147561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86192656 + 79548561 = 9284^2 + 8919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165741217 is a prime.

It is not a weakly prime, because it can be changed into another prime (165741227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82870608 + 82870609.

It is an arithmetic number, because the mean of its divisors is an integer number (82870609).

Almost surely, 2^165741217 is an apocalyptic number.

It is an amenable number.

165741217 is a deficient number, since it is larger than the sum of its proper divisors (1).

165741217 is an equidigital number, since it uses as much as digits as its factorization.

165741217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The square root of 165741217 is about 12874.0520816097. The cubic root of 165741217 is about 549.3007278484.

Adding to 165741217 its reverse (712147561), we get a palindrome (877888778).

The spelling of 165741217 in words is "one hundred sixty-five million, seven hundred forty-one thousand, two hundred seventeen".