165085281 has 12 divisors (see below), whose sum is σ = 251007120. Its totient is φ = 104264280.

The previous prime is 165085267. The next prime is 165085289. The reversal of 165085281 is 182580561.

It is not a de Polignac number, because 165085281 - 2⁹ = 165084769 is a prime.

It is a super-2 number, since 2×165085281² = 54506300005697922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165085289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 482535 + ... + 482876.

It is an arithmetic number, because the mean of its divisors is an integer number (20917260).

Almost surely, 2^165085281 is an apocalyptic number.

It is an amenable number.

165085281 is a deficient number, since it is larger than the sum of its proper divisors (85921839).

165085281 is a wasteful number, since it uses less digits than its factorization.

165085281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965436 (or 965433 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 165085281 is about 12848.5517082666. The cubic root of 165085281 is about 548.5751338745.

The spelling of 165085281 in words is "one hundred sixty-five million, eighty-five thousand, two hundred eighty-one".