165095221 has 4 divisors (see below), whose sum is σ = 169557292. Its totient is φ = 160633152.

The previous prime is 165095213. The next prime is 165095269. The reversal of 165095221 is 122590561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122590561 = 4793 ⋅25577.

It can be written as a sum of positive squares in 2 ways, for example, as 70324996 + 94770225 = 8386^2 + 9735^2 .

It is a cyclic number.

It is not a de Polignac number, because 165095221 - 2³ = 165095213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165095321) 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, 2230980 + ... + 2231053.

It is an arithmetic number, because the mean of its divisors is an integer number (42389323).

Almost surely, 2^165095221 is an apocalyptic number.

It is an amenable number.

165095221 is a deficient number, since it is larger than the sum of its proper divisors (4462071).

165095221 is an equidigital number, since it uses as much as digits as its factorization.

165095221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4462070.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 165095221 is about 12848.9385164690. The cubic root of 165095221 is about 548.5861437948.

The spelling of 165095221 in words is "one hundred sixty-five million, ninety-five thousand, two hundred twenty-one".