165120211 has 2 divisors, whose sum is σ = 165120212. Its totient is φ = 165120210.

The previous prime is 165120169. The next prime is 165120217. The reversal of 165120211 is 112021561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165120211 - 2⁷ = 165120083 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165120217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82560105 + 82560106.

It is an arithmetic number, because the mean of its divisors is an integer number (82560106).

Almost surely, 2^165120211 is an apocalyptic number.

165120211 is a deficient number, since it is larger than the sum of its proper divisors (1).

165120211 is an equidigital number, since it uses as much as digits as its factorization.

165120211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 165120211 is about 12849.9109335435. The cubic root of 165120211 is about 548.6138217131.

Adding to 165120211 its reverse (112021561), we get a palindrome (277141772).

The spelling of 165120211 in words is "one hundred sixty-five million, one hundred twenty thousand, two hundred eleven".