165901089 has 4 divisors (see below), whose sum is σ = 221201456. Its totient is φ = 110600724.

The previous prime is 165901067. The next prime is 165901121. The reversal of 165901089 is 980109561.

165901089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 980109561 = 3 ⋅326703187.

It is not a de Polignac number, because 165901089 - 2⁷ = 165900961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165901049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27650179 + ... + 27650184.

It is an arithmetic number, because the mean of its divisors is an integer number (55300364).

Almost surely, 2^165901089 is an apocalyptic number.

It is an amenable number.

165901089 is a deficient number, since it is larger than the sum of its proper divisors (55300367).

165901089 is an equidigital number, since it uses as much as digits as its factorization.

165901089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55300366.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 165901089 is about 12880.2596635316. The cubic root of 165901089 is about 549.4772874004.

The spelling of 165901089 in words is "one hundred sixty-five million, nine hundred one thousand, eighty-nine".