165221141 has 4 divisors (see below), whose sum is σ = 165254400. Its totient is φ = 165187884.

The previous prime is 165221107. The next prime is 165221171. The reversal of 165221141 is 141122561.

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 165221141 - 2¹⁰ = 165220117 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 (165221101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7511 + ... + 19668.

It is an arithmetic number, because the mean of its divisors is an integer number (41313600).

Almost surely, 2^165221141 is an apocalyptic number.

It is an amenable number.

165221141 is a deficient number, since it is larger than the sum of its proper divisors (33259).

165221141 is an equidigital number, since it uses as much as digits as its factorization.

165221141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33258.

The product of its digits is 480, while the sum is 23.

The square root of 165221141 is about 12853.8375981650. The cubic root of 165221141 is about 548.7255793118.

The spelling of 165221141 in words is "one hundred sixty-five million, two hundred twenty-one thousand, one hundred forty-one".