90775081 has 2 divisors, whose sum is σ = 90775082. Its totient is φ = 90775080.

The previous prime is 90775079. The next prime is 90775117. The reversal of 90775081 is 18057709.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88266025 + 2509056 = 9395^2 + 1584^2 .

It is an emirp because it is prime and its reverse (18057709) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90775081 - 2¹ = 90775079 is a prime.

It is a super-2 number, since 2×90775081² = 16480230661113122, which contains 22 as substring.

Together with 90775079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 90775081.

It is not a weakly prime, because it can be changed into another prime (90775031) 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, 45387540 + 45387541.

It is an arithmetic number, because the mean of its divisors is an integer number (45387541).

Almost surely, 2^90775081 is an apocalyptic number.

It is an amenable number.

90775081 is a deficient number, since it is larger than the sum of its proper divisors (1).

90775081 is an equidigital number, since it uses as much as digits as its factorization.

90775081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 90775081 is about 9527.5957617859. The cubic root of 90775081 is about 449.4232627934.

The spelling of 90775081 in words is "ninety million, seven hundred seventy-five thousand, eighty-one".