89105581 has 2 divisors, whose sum is σ = 89105582. Its totient is φ = 89105580.

The previous prime is 89105539. The next prime is 89105617. The reversal of 89105581 is 18550198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 25664356 = 7965^2 + 5066^2 .

It is a cyclic number.

It is not a de Polignac number, because 89105581 - 2⁷ = 89105453 is a prime.

It is a super-2 number, since 2×89105581² = 15879609130695122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 89105581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89105521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44552790 + 44552791.

It is an arithmetic number, because the mean of its divisors is an integer number (44552791).

Almost surely, 2^89105581 is an apocalyptic number.

It is an amenable number.

89105581 is a deficient number, since it is larger than the sum of its proper divisors (1).

89105581 is an equidigital number, since it uses as much as digits as its factorization.

89105581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 89105581 is about 9439.5752552750. The cubic root of 89105581 is about 446.6509911951.

It can be divided in two parts, 891055 and 81, that added together give a square (891136 = 944²).

The spelling of 89105581 in words is "eighty-nine million, one hundred five thousand, five hundred eighty-one".