165211311 has 8 divisors (see below), whose sum is σ = 222231600. Its totient is φ = 109165952.

The previous prime is 165211309. The next prime is 165211313. The reversal of 165211311 is 113112561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (165211309) and next prime (165211313).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165211311 - 2¹ = 165211309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165211313) 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 7 ways as a sum of consecutive naturals, for example, 243336 + ... + 244013.

It is an arithmetic number, because the mean of its divisors is an integer number (27778950).

Almost surely, 2^165211311 is an apocalyptic number.

165211311 is a deficient number, since it is larger than the sum of its proper divisors (57020289).

165211311 is a wasteful number, since it uses less digits than its factorization.

165211311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487465.

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

The square root of 165211311 is about 12853.4552164000. The cubic root of 165211311 is about 548.7146967670.

Adding to 165211311 its reverse (113112561), we get a palindrome (278323872).

The spelling of 165211311 in words is "one hundred sixty-five million, two hundred eleven thousand, three hundred eleven".