90281 has 2 divisors, whose sum is σ = 90282.
Its totient is φ = 90280.
The previous prime is 90271. The next prime is 90289. The reversal of 90281 is 18209.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 78400 + 11881 = 280^2 + 109^2
It is a cyclic number.
It is not a de Polignac number, because 90281 - 26 = 90217 is a prime.
It is a super-2 number, since 2×902812 = 16301317922, which contains 22 as substring.
It is a Sophie Germain prime.
It is a Chen prime.
It is a Curzon number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 90281.
It is not a weakly prime, because it can be changed into another prime (90289) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45140 + 45141.
It is an arithmetic number, because the mean of its divisors is an integer number (45141).
290281 is an apocalyptic number.
It is an amenable number.
90281 is a deficient number, since it is larger than the sum of its proper divisors (1).
90281 is an equidigital number, since it uses as much as digits as its factorization.
90281 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 144, while the sum is 20.
The square root of 90281 is about 300.4679683427.
The cubic root of 90281 is about 44.8606388146.
The spelling of 90281 in words is "ninety thousand, two hundred eighty-one".