90128771 has 2 divisors, whose sum is σ = 90128772. Its totient is φ = 90128770.

The previous prime is 90128741. The next prime is 90128791. The reversal of 90128771 is 17782109.

It is a strong prime.

It is an emirp because it is prime and its reverse (17782109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90128771 - 2²⁶ = 23019907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90128711) 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, 45064385 + 45064386.

It is an arithmetic number, because the mean of its divisors is an integer number (45064386).

Almost surely, 2^90128771 is an apocalyptic number.

90128771 is a deficient number, since it is larger than the sum of its proper divisors (1).

90128771 is an equidigital number, since it uses as much as digits as its factorization.

90128771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 90128771 is about 9493.6173822205. The cubic root of 90128771 is about 448.3541042724.

The spelling of 90128771 in words is "ninety million, one hundred twenty-eight thousand, seven hundred seventy-one".