890000081 has 2 divisors, whose sum is σ = 890000082. Its totient is φ = 890000080.

The previous prime is 890000063. The next prime is 890000093. The reversal of 890000081 is 180000098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 887503681 + 2496400 = 29791^2 + 1580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-890000081 is a prime.

It is a super-2 number, since 2×890000081² = 1584200288360013122, 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 890000081.

It is not a weakly prime, because it can be changed into another prime (890000011) 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 as a sum of consecutive naturals, namely, 445000040 + 445000041.

It is an arithmetic number, because the mean of its divisors is an integer number (445000041).

Almost surely, 2^890000081 is an apocalyptic number.

It is an amenable number.

890000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

890000081 is an equidigital number, since it uses as much as digits as its factorization.

890000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 890000081 is about 29832.8691379156. The cubic root of 890000081 is about 961.9002007889.

The spelling of 890000081 in words is "eight hundred ninety million, eighty-one", and thus it is an aban number.