165001121 has 2 divisors, whose sum is σ = 165001122. Its totient is φ = 165001120.

The previous prime is 165001117. The next prime is 165001147. The reversal of 165001121 is 121100561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145323025 + 19678096 = 12055^2 + 4436^2 .

It is an emirp because it is prime and its reverse (121100561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165001121 - 2² = 165001117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165001121.

It is not a weakly prime, because it can be changed into another prime (165001021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82500560 + 82500561.

It is an arithmetic number, because the mean of its divisors is an integer number (82500561).

Almost surely, 2^165001121 is an apocalyptic number.

It is an amenable number.

165001121 is a deficient number, since it is larger than the sum of its proper divisors (1).

165001121 is an equidigital number, since it uses as much as digits as its factorization.

165001121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 165001121 is about 12845.2762134568. The cubic root of 165001121 is about 548.4818973552.

Adding to 165001121 its reverse (121100561), we get a palindrome (286101682).

The spelling of 165001121 in words is "one hundred sixty-five million, one thousand, one hundred twenty-one".