165271217 has 4 divisors (see below), whose sum is σ = 165399360. Its totient is φ = 165143076.

The previous prime is 165271207. The next prime is 165271241. The reversal of 165271217 is 712172561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165271217 - 2⁸ = 165270961 is a prime.

It is a super-2 number, since 2×165271217² = 54629150337322178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165271207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62117 + ... + 64722.

It is an arithmetic number, because the mean of its divisors is an integer number (41349840).

Almost surely, 2^165271217 is an apocalyptic number.

It is an amenable number.

165271217 is a deficient number, since it is larger than the sum of its proper divisors (128143).

165271217 is a wasteful number, since it uses less digits than its factorization.

165271217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128142.

The product of its digits is 5880, while the sum is 32.

The square root of 165271217 is about 12855.7853513506. The cubic root of 165271217 is about 548.7810104880.

The spelling of 165271217 in words is "one hundred sixty-five million, two hundred seventy-one thousand, two hundred seventeen".