165333121 has 2 divisors, whose sum is σ = 165333122. Its totient is φ = 165333120.

The previous prime is 165333097. The next prime is 165333149. The reversal of 165333121 is 121333561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161569521 + 3763600 = 12711^2 + 1940^2 .

It is an emirp because it is prime and its reverse (121333561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165333121 - 2¹¹ = 165331073 is a prime.

It is not a weakly prime, because it can be changed into another prime (165333221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82666560 + 82666561.

It is an arithmetic number, because the mean of its divisors is an integer number (82666561).

Almost surely, 2^165333121 is an apocalyptic number.

It is an amenable number.

165333121 is a deficient number, since it is larger than the sum of its proper divisors (1).

165333121 is an equidigital number, since it uses as much as digits as its factorization.

165333121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 25.

The square root of 165333121 is about 12858.1927579268. The cubic root of 165333121 is about 548.8495190880.

Adding to 165333121 its reverse (121333561), we get a palindrome (286666682).

The spelling of 165333121 in words is "one hundred sixty-five million, three hundred thirty-three thousand, one hundred twenty-one".