165001609 has 16 divisors (see below), whose sum is σ = 182891520. Its totient is φ = 148065280.

The previous prime is 165001601. The next prime is 165001649. The reversal of 165001609 is 906100561.

It is a cyclic number.

It is not a de Polignac number, because 165001609 - 2³ = 165001601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165001601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186849 + ... + 187729.

It is an arithmetic number, because the mean of its divisors is an integer number (11430720).

Almost surely, 2^165001609 is an apocalyptic number.

It is an amenable number.

165001609 is a deficient number, since it is larger than the sum of its proper divisors (17889911).

165001609 is a wasteful number, since it uses less digits than its factorization.

165001609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 165001609 is about 12845.2952087525. The cubic root of 165001609 is about 548.4824380766.

The spelling of 165001609 in words is "one hundred sixty-five million, one thousand, six hundred nine".