89163581 has 4 divisors (see below), whose sum is σ = 96022332. Its totient is φ = 82304832.

The previous prime is 89163577. The next prime is 89163583. The reversal of 89163581 is 18536198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18536198 = 2 ⋅9268099.

It can be written as a sum of positive squares in 2 ways, for example, as 26357956 + 62805625 = 5134^2 + 7925^2 .

It is a cyclic number.

It is not a de Polignac number, because 89163581 - 2² = 89163577 is a prime.

It is a super-2 number, since 2×89163581² = 15900288353487122, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89163583) 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, 3429356 + ... + 3429381.

It is an arithmetic number, because the mean of its divisors is an integer number (24005583).

Almost surely, 2^89163581 is an apocalyptic number.

It is an amenable number.

89163581 is a deficient number, since it is larger than the sum of its proper divisors (6858751).

89163581 is a wasteful number, since it uses less digits than its factorization.

89163581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6858750.

The product of its digits is 51840, while the sum is 41.

The square root of 89163581 is about 9442.6469276363. The cubic root of 89163581 is about 446.7478805199.

The spelling of 89163581 in words is "eighty-nine million, one hundred sixty-three thousand, five hundred eighty-one".