89918809 has 4 divisors (see below), whose sum is σ = 90415780. Its totient is φ = 89421840.

The previous prime is 89918791. The next prime is 89918813. The reversal of 89918809 is 90881998.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12531600 + 77387209 = 3540^2 + 8797^2 .

It is a cyclic number.

It is not a de Polignac number, because 89918809 - 2¹³ = 89910617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89918509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248214 + ... + 248575.

It is an arithmetic number, because the mean of its divisors is an integer number (22603945).

Almost surely, 2^89918809 is an apocalyptic number.

It is an amenable number.

89918809 is a deficient number, since it is larger than the sum of its proper divisors (496971).

89918809 is a wasteful number, since it uses less digits than its factorization.

89918809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496970.

The product of its (nonzero) digits is 373248, while the sum is 52.

The square root of 89918809 is about 9482.5528735673. The cubic root of 89918809 is about 448.0056749520.

The spelling of 89918809 in words is "eighty-nine million, nine hundred eighteen thousand, eight hundred nine".