165908489 has 4 divisors (see below), whose sum is σ = 166742400. Its totient is φ = 165074580.

The previous prime is 165908473. The next prime is 165908503. The reversal of 165908489 is 984809561.

It is a happy number.

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 165908489 - 2⁴ = 165908473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165908429) 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 3 ways as a sum of consecutive naturals, for example, 416657 + ... + 417054.

It is an arithmetic number, because the mean of its divisors is an integer number (41685600).

Almost surely, 2^165908489 is an apocalyptic number.

It is an amenable number.

165908489 is a deficient number, since it is larger than the sum of its proper divisors (833911).

165908489 is an equidigital number, since it uses as much as digits as its factorization.

165908489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833910.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 165908489 is about 12880.5469216179. The cubic root of 165908489 is about 549.4854570704.

The spelling of 165908489 in words is "one hundred sixty-five million, nine hundred eight thousand, four hundred eighty-nine".