165311211 has 16 divisors (see below), whose sum is σ = 238160384. Its totient is φ = 101391264.

The previous prime is 165311141. The next prime is 165311231. The reversal of 165311211 is 112113561.

It is a happy number.

It is not a de Polignac number, because 165311211 - 2⁹ = 165310699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165311231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5070 + ... + 18876.

It is an arithmetic number, because the mean of its divisors is an integer number (14885024).

Almost surely, 2^165311211 is an apocalyptic number.

165311211 is a deficient number, since it is larger than the sum of its proper divisors (72849173).

165311211 is a wasteful number, since it uses less digits than its factorization.

165311211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14130.

The product of its digits is 180, while the sum is 21.

The square root of 165311211 is about 12857.3407437152. The cubic root of 165311211 is about 548.8252734435.

Adding to 165311211 its reverse (112113561), we get a palindrome (277424772).

The spelling of 165311211 in words is "one hundred sixty-five million, three hundred eleven thousand, two hundred eleven".