165215201 has 2 divisors, whose sum is σ = 165215202. Its totient is φ = 165215200.

The previous prime is 165215179. The next prime is 165215221. The reversal of 165215201 is 102512561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126787600 + 38427601 = 11260^2 + 6199^2 .

It is a cyclic number.

It is not a de Polignac number, because 165215201 - 2²² = 161020897 is a prime.

It is not a weakly prime, because it can be changed into another prime (165215221) 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 as a sum of consecutive naturals, namely, 82607600 + 82607601.

It is an arithmetic number, because the mean of its divisors is an integer number (82607601).

Almost surely, 2^165215201 is an apocalyptic number.

It is an amenable number.

165215201 is a deficient number, since it is larger than the sum of its proper divisors (1).

165215201 is an equidigital number, since it uses as much as digits as its factorization.

165215201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 165215201 is about 12853.6065366884. The cubic root of 165215201 is about 548.7190033394.

Adding to 165215201 its reverse (102512561), we get a palindrome (267727762).

The spelling of 165215201 in words is "one hundred sixty-five million, two hundred fifteen thousand, two hundred one".