89165809 has 4 divisors (see below), whose sum is σ = 89699904. Its totient is φ = 88631716.

The previous prime is 89165801. The next prime is 89165831. The reversal of 89165809 is 90856198.

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: 90856198 = 2 ⋅45428099.

It is a cyclic number.

It is not a de Polignac number, because 89165809 - 2³ = 89165801 is a prime.

It is a super-4 number, since 4×89165809⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89165801) 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, 266797 + ... + 267130.

It is an arithmetic number, because the mean of its divisors is an integer number (22424976).

Almost surely, 2^89165809 is an apocalyptic number.

It is an amenable number.

89165809 is a deficient number, since it is larger than the sum of its proper divisors (534095).

89165809 is a wasteful number, since it uses less digits than its factorization.

89165809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534094.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 89165809 is about 9442.7649022942. The cubic root of 89165809 is about 446.7516015682.

The spelling of 89165809 in words is "eighty-nine million, one hundred sixty-five thousand, eight hundred nine".