90889081 has 2 divisors, whose sum is σ = 90889082. Its totient is φ = 90889080.

The previous prime is 90889079. The next prime is 90889091. The reversal of 90889081 is 18098809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90079081 + 810000 = 9491^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 90889081 - 2¹ = 90889079 is a prime.

It is a super-2 number, since 2×90889081² = 16521650090049122, which contains 22 as substring.

Together with 90889079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (90889091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45444540 + 45444541.

It is an arithmetic number, because the mean of its divisors is an integer number (45444541).

Almost surely, 2^90889081 is an apocalyptic number.

It is an amenable number.

90889081 is a deficient number, since it is larger than the sum of its proper divisors (1).

90889081 is an equidigital number, since it uses as much as digits as its factorization.

90889081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 90889081 is about 9533.5765062226. The cubic root of 90889081 is about 449.6113203485.

The spelling of 90889081 in words is "ninety million, eight hundred eighty-nine thousand, eighty-one".