89555581 has 2 divisors, whose sum is σ = 89555582. Its totient is φ = 89555580.

The previous prime is 89555573. The next prime is 89555639. The reversal of 89555581 is 18555598.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83429956 + 6125625 = 9134^2 + 2475^2 .

It is a cyclic number.

It is not a de Polignac number, because 89555581 - 2³ = 89555573 is a prime.

It is a super-2 number, since 2×89555581² = 16040404176495122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89555981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44777790 + 44777791.

It is an arithmetic number, because the mean of its divisors is an integer number (44777791).

Almost surely, 2^89555581 is an apocalyptic number.

It is an amenable number.

89555581 is a deficient number, since it is larger than the sum of its proper divisors (1).

89555581 is an equidigital number, since it uses as much as digits as its factorization.

89555581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360000, while the sum is 46.

The square root of 89555581 is about 9463.3810554157. The cubic root of 89555581 is about 447.4016196037.

The spelling of 89555581 in words is "eighty-nine million, five hundred fifty-five thousand, five hundred eighty-one".