165170091 has 8 divisors (see below), whose sum is σ = 220294720. Its totient is φ = 110079432.

The previous prime is 165170063. The next prime is 165170129. The reversal of 165170091 is 190071561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165170091 - 2¹⁴ = 165153707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165170191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6780 + ... + 19398.

It is an arithmetic number, because the mean of its divisors is an integer number (27536840).

Almost surely, 2^165170091 is an apocalyptic number.

165170091 is a deficient number, since it is larger than the sum of its proper divisors (55124629).

165170091 is a wasteful number, since it uses less digits than its factorization.

165170091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16985.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 165170091 is about 12851.8516564735. The cubic root of 165170091 is about 548.6690584448.

The spelling of 165170091 in words is "one hundred sixty-five million, one hundred seventy thousand, ninety-one".