165211313 has 2 divisors, whose sum is σ = 165211314. Its totient is φ = 165211312.

The previous prime is 165211309. The next prime is 165211331. The reversal of 165211313 is 313112561.

Together with next prime (165211331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151609969 + 13601344 = 12313^2 + 3688^2 .

It is an emirp because it is prime and its reverse (313112561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165211313 - 2² = 165211309 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165211303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82605656 + 82605657.

It is an arithmetic number, because the mean of its divisors is an integer number (82605657).

Almost surely, 2^165211313 is an apocalyptic number.

It is an amenable number.

165211313 is a deficient number, since it is larger than the sum of its proper divisors (1).

165211313 is an equidigital number, since it uses as much as digits as its factorization.

165211313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 165211313 is about 12853.4552942001. The cubic root of 165211313 is about 548.7146989812.

Adding to 165211313 its reverse (313112561), we get a palindrome (478323874).

The spelling of 165211313 in words is "one hundred sixty-five million, two hundred eleven thousand, three hundred thirteen".